Teenage Mutant Ninja Turtles (1987 TV series, season 4)

Vengeful Baxter Stockman and an A.I. computer return to Earth from a dimensional limbo and capture the Turtles while luring Shredder into their trap as well.

Villains: Shredder and Baxter Stockman

Note: The intro has been changed with new animation.

Note: This is the first episode while The live action film was being made.

Note: Will return in the series fifth season in the series "Landlord of the Flies"

Note: As in earlier series after Baxter Stockman in the third season: "Bye, Bye, Fly"

Note: 14 episode with Technodrome in dimension X in season 4 and sideseason Vacation in Europe

Note:The second screensaver of the animated series was used beginning on the part of the 4th season from Son of Return of the Fly II to the 7th season ending before Shredder Triumphant!

Raphael must contend with a mobster named Pinky McFingers when he is kidnapped from a local comedy club. (This is Professor Barney Stockman's only episode - related to Baxter Stockman.)

Note: Master Splinter is not in this episode.

Note: Shredder. Krang, Bebop and Rocksteady are not in this episode.

Villain: Pinky McFingers

Note: First appearance of Pinky McFingers.

Note: Pinky McFingers Will return in the series of the fifth season: "Donatello's Duplicate"

Note:The second screensaver of the animated series was used beginning on the part of the 4th season from Son of Return of the Fly II to the 7th season ending before Shredder Triumphant!

With the Technodrome in serious need for new equipment, Bebop and Rocksteady are sent to Earth, disguised in human form, to capture the Channel 6 building and take it to Dimension X. To keep the Turtles distracted, Rocksteady & Bebop also deploy a robot duplicate of Master Splinter, but it malfunctions and starts going gonzo.

Villain: Shredder

Title Reference: Plan 9 from Outer Space

Note: 1 episode with Technodrome in dimension X in season 4 and sideseason Vacation in Europe

Note: The first screensaver of the animated series was extended from the 1st to the 4th part of the season and sideseason in vacation in Europe

A professor's new ray-gun causes plants to go wild and his pet ape Jocko to become a giant rampaging monkey. By using the same ray-gun, Donatello is increased to Jocko's size so he can fight the giant ape and save April from him.

Villain: Shredder

Note: 2 episode with Technodrome in dimension X in season 4 and sideseason Vacation in Europe

Note: The first screensaver of the animated series was extended from the 1st to the 4th part of the season and sideseason in vacation in Europe

While trying to see the new toys at the Toy Fair, Michelangelo stumbles upon a plot to take over a noted toy company.

Note: Master Splinter is not in this episode.

Note: Shredder, Krang and Bebop and Rocksteady are not in this episode.

Villain: Wilbur Weasell

Note: The first screensaver of the animated series was extended from the 1st to the 4th part of the season and sideseason in vacation in Europe

The Turtles must battle a reanimated Terracotta Army after The Shredder steals an energy device shaped like a giant pearl, which is held and guarded by a Jade Dragon.

Villain: Shredder

Note: 3 episode with Technodrome in dimension X in season 4 and sideseason Vacation in Europe

Note: The first screensaver of the animated series was extended from the 1st to the 4th part of the season and sideseason in vacation in Europe

Krang frees Miyoko Saki, Shredder's mother from the retirement community. Shredder threatens the world's governments to surrender to Krang or he will gradually raise the world's heat, which causes New York to be in the middle of a massive heat wave. The Turtles get help from Colonel Yogurt, an air force officer to thwart Shredder, who is starting to get annoyed with his mother's success.

Villain: Shredder

Note: 4 episode with Technodrome in dimension X in season 4 and sideseason Vacation in Europe

Note: The first screensaver of the animated series was extended from the 1st to the 4th part of the season and sideseason in vacation in Europe

On their latest trip to Earth, Bebop and Rocksteady steal a machine that makes everyone scared of everything.

Title Reference: Flash Gordon Conquers the Universe

Villain: Shredder

Note: Zach will return in the sixth season the fifth episode: "Zach and the Alien Invaders"

Note: 15 episode with Technodrome in dimension X in season 4 and sideseason Vacation in Europe

Note:The second screensaver of the animated series was used beginning on the part of the 4th season from Son of Return of the Fly II to the 7th season ending before Shredder Triumphant!

Raphael wins a place at the owner of a fast food chain's party. When the yacht is taken hostage by Hi-Tech pirates he and the mysterious lizard-woman Mona Lisa work together to stop them.

Note: Shredder, Krang, Bebop and Rocksteady are not in this episode.

Villain: Captain Filch

Note:The second screensaver of the animated series was used beginning on the part of the 4th season from Son of Return of the Fly II to the 7th season ending before Shredder Triumphant!

When General Tragg and his troops attack the Neutrino planet capital, the Neutrino leaders, King Zenter and Queen Gizzla, send their infant daughter Tribble through a portal to Earth, asking the Turtles to look after her, but Tribble causes big trouble for our heroes.

Villain: Shredder

Title Reference: Three Men and a Baby

Note: Master Splinter is not in this episode.

Note: 5 episode with Technodrome in dimension X in season 4 and sideseason Vacation in Europe

Note: The first screensaver of the animated series was extended from the 1st to the 4th part of the season and sideseason in vacation in Europe

An eccentric billionaire, Monroe Q. Flem, who is also a collector, wishes to collect every piece of TMNT memorabilia that he can get his evil hands on, including April O'Neil and the Turtles themselves. Title Reference: Lisztomania

Note: Shredder, Krang, Bebop and Rocksteady are not in this episode.

Villain: Monroe Q. Flem

Note: The first screensaver of the animated series was extended from the 1st to the 4th part of the season and sideseason in vacation in Europe

A big-time Hollywood action movie star arrives in New York to promote his newest movie. Unfortunately, reality hits hard for Michelangelo as he discovers that his movie idol is not all he's cracked up to be. Meanwhile, Shredder and Krang steal a substance that can bring inanimate objects to life.

Villain: Shredder

Note: 6 episode with Technodrome in dimension X in season 4 and sideseason Vacation in Europe

Note: The first screensaver of the animated series was extended from the 1st to the 4th part of the season and sideseason in vacation in Europe

The Turtles must save the Earth from a massive energy drain and its Apocalyptic result by traveling to another planet where turtles are the dominant species.

Villain: Shredder

Note: Bebop and Rocksteady are not in this episode.

Title Reference: Planet of the Apes

Note: 7 episode with Technodrome in dimension X in season 4 and sideseason Vacation in Europe

Note: The first screensaver of the animated series was extended from the 1st to the 4th part of the season and sideseason in vacation in Europe

A Technodrome computer disguised as an electronic keyboard ends up on Earth, and in the most unlikely of hands.

Villain: Shredder

Note: First appearance of Howie.

Title Reference: Name That Tune

Note: 8 episode with Technodrome in dimension X in season 4 and sideseason Vacation in Europe

Note: The first screensaver of the animated series was extended from the 1st to the 4th part of the season and sideseason in vacation in Europe

Bebop and Rocksteady use Krang's new Mutagen on Bebop's pet turtle Slash so he can do their housework for them. Slash runs away and is conned by an irritated entrepreneur into framing the TMNT.

Villain: Shredder, Slash, Fenton Q. Hackenbrush

Note: First Appearance of Slash and Donald J. Lofty.

Note: Will return in the series six season "Donatello Trashes Slash"

Note: Donald J. Lofty Will return in the series "The Big Zipp Attack"

Note: 16 episode with Technodrome in dimension X in season 4 and sideseason Vacation in Europe

Note:The second screensaver of the animated series was used beginning on the part of the 4th season from Son of Return of the Fly II to the 7th season ending before Shredder Triumphant!

Frustrated with his bossy nature, Raphael and Michelangelo accidentally shoot Leonardo with the personality modifying ray, turning him into a fun loving 'dude' who neglects his responsibilities. Donatello Raphael and Michelangelo must stop Maestro G. Cleff from destroying the city.

Note: Shredder, Krang, Bebop and Rocksteady are not in this episode.

Villain: G. Cleff

Note:The second screensaver of the animated series was used beginning on the part of the 4th season from Son of Return of the Fly II to the 7th season ending before Shredder Triumphant!

The Turtles meet Irma's boyfriend Howie, who has bought an old opera house with the intent of turning it into a nightclub. The Turtles must contend with the "Phantom of the Floxy", as does Shredder, who is planning to get the Technodrome back to Earth.

Villain: Shredder

Note: Final appearance of Howie.

Note: Master Splinter is not in this episode.

Note: 9 episode with Technodrome in dimension X in season 4 and sideseason Vacation in Europe

Note: The first screensaver of the animated series was extended from the 1st to the 4th part of the season and sideseason in vacation in Europe

Krang hires a multi-dimensional ring-master who intends on making the Teenage Mutant Ninja Turtles part of his circus by using an anti-aging serum. Leonardo and Michelangelo are turned into 5 Year olds.

Villain: Shredder

Title Reference: Back to the Egg

Note: Master Splinter and Bebop and Rocksteady are not in this episode.

Note: 11 episode with Technodrome in dimension X in season 4 and sideseason Vacation in Europe

Note: The first screensaver of the animated series was extended from the 1st to the 4th part of the season and sideseason in vacation in Europe

After many failed attempts from his rodent subjects to find food, the Rat King learns of an abandoned canister of mutagen lost in the sewers and claims it for himself. Then, he kidnaps Irma and Vernon and uses the mutagen to transform them into his mutant slaves, for the sole purpose of raiding food warehouses. It is later discovered that the mutations are unstable and can only be active if the Rat King plays his hypnotic flute.

Villains: Shredder and the Rat King

Note: As in earlier series after Rat King in the third season: "Leatherhead Meets the Rat King"

Note: Rat King Will return in the series "Splinter Vanishes"

Note: 17 episode with Technodrome in dimension X in season 4 and sideseason Vacation in Europe

Note:The second screensaver of the animated series was used beginning on the part of the 4th season from Son of Return of the Fly II to the 7th season ending before Shredder Triumphant!

When Michelangelo decides to put one of Donatello's inventions on max power for his own entertainment, he ends in a—quite literally—little problem. April and Vernon get caught in the shrinking ray while getting footage of a military ship and join Michelangelo on his wild adventure.

Title reference: Honey, I Shrunk the Kids

Note: Shredder, Krang, Bebop and Rocksteady are not in this episode.

Villain: Talbot Breech

Note:The second screensaver of the animated series was used beginning on the part of the 4th season from Son of Return of the Fly II to the 7th season ending before Shredder Triumphant!

An alien called a "Zipp" is sent to Earth, but this little alien soon becomes a big problem.

Villain: Shredder

Note: Second appearance of Donald J. Lofty.

Note: As in earlier series after Donald J. Lofty in the: "Slash – The Evil Turtle from Dimension X"

Note: Donald J. Lofty Will return in the series "Rebel Without a Fin"

Note: 18 episode with Technodrome in dimension X in season 4 and sideseason Vacation in Europe

Note:The second screensaver of the animated series was used beginning on the part of the 4th season from Son of Return of the Fly II to the 7th season ending before Shredder Triumphant!

Donatello invents a machine that can freeze time, which a deranged professor steals as part of a plan to conquer the world.

Note: Shredder, Krang, Bebop and Rocksteady are not in this episode.

Villain: Lloyd Cycloid

Note:The second screensaver of the animated series was used beginning on the part of the 4th season from Son of Return of the Fly II to the 7th season ending before Shredder Triumphant!

Ninja Lotus Blossom's nightmares draw her to a strange artifact in the Turtles' possession. The artifact contains an angry spirit, whose dearest wife's spirit/soul is lying deep within Lotus herself.

Villain: Shredder, Chakahachi, thieves

Note: This was Lotus' second and final appearance in the whole series.

Note: As in earlier series after Lotus in the third season: "Beware the Lotus"

Note: 19 episode with Technodrome in dimension X in season 4 and sideseason Vacation in Europe

Note:The second screensaver of the animated series was used beginning on the part of the 4th season from Son of Return of the Fly II to the 7th season ending before Shredder Triumphant!

Dr. Polidorius, a mad scientist plotting to mutate all humanity into aquatic-beings, creates Ray (not the similarly-named Mighty Mutanimals character), who possesses several abilities of different marine species. Ray kidnaps April O'Neil, and Polidorius mutates her into a fish-woman to be Ray's mate.

Note: Final appearance of Donald J. Lofty.

Title reference: Rebel Without a Cause

Note: Shredder, Krang, Bebop and Rocksteady are not in this episode.

Villain: Dr. Polidorius

Note: As in earlier series after Donald J. Lofty in the: "Slash – The Evil Turtle from Dimension X" and "The Big Zipp Attack"

Note:The second screensaver of the animated series was used beginning on the part of the 4th season from Son of Return of the Fly II to the 7th season ending before Shredder Triumphant!

Bebop and Rocksteady dress up as superheroes as part of a plot to steal a diamond that will power up a laser Krang has created. Meanwhile, the Turtles must deal with a wave of hypnotic slaves under the command of J. Gordon HungerDunger.

Villains: Shredder and J. Gordon HungerDunger

Note: 20 episode with Technodrome in dimension X in season 4 and sideseason Vacation in Europe

Note:The second screensaver of the animated series was used beginning on the part of the 4th season from Son of Return of the Fly II to the 7th season ending before Shredder Triumphant!

Michelangelo meets his favourite comic book hero after he saves a weakened Brick Bradley in the sewers, and then he and Bugman take on the evil Electrozapper together.

Note: First appearance of Bugman.

Note: Shredder, Krang, Bebop and Rocksteady are not in this episode.

Villain: Electrozapper

Note: Will return in the series fifth season in the series "Michelangelo Meets Bugman Again"

Note:The second screensaver of the animated series was used beginning on the part of the 4th season from Son of Return of the Fly II to the 7th season ending before Shredder Triumphant!

The Turtles must baby-sit and protect a young rich girl named Buffy Shellhammer from Shredder and Krang, as she knows of a formula for a super fuel needed for the Technodrome.

Villain: Shredder

Title reference: The Poor Little Rich Girl

Note: 21 episode with Technodrome in dimension X in season 4 and sideseason Vacation in Europe

Note:The second screensaver of the animated series was used beginning on the part of the 4th season from Son of Return of the Fly II to the 7th season ending before Shredder Triumphant!

Michelangelo must rescue the other Turtles when they are captured by an evil scientist.

Note: Shredder, Krang, Bebop and Rocksteady are not in this episode.

Villain: Dr. Lesseau

Note:The second screensaver of the animated series was used beginning on the part of the 4th season from Son of Return of the Fly II to the 7th season ending before Shredder Triumphant!

Shredder has a plan to destroy the Turtles, but with the Technodrome's portal out of commission, he is unable to challenge them on Earth, so he uses the Dimensional Teleporter to bring his enemies to Dimension X.

Note: This is the final episode in which Michelangelo uses nunchaku as his main weapon rather than a grappling hook.

Villain: Shredder

Note: 22 episode with Technodrome in dimension X in season 4 and sideseason Vacation in Europe

Note:The second screensaver of the animated series was used beginning on the part of the 4th season from Son of Return of the Fly II to the 7th season ending before Shredder Triumphant!

Donatello earns his degree from Sopho University, but discovers that he has been mistaken for a girl, so he asks Irma to masquerade as him. Meanwhile, the real Donatello discovers a plot by Professor Philo Sopho to destroy the Earth.

Note: First appearance of Professor Sopho.

Note: Shredder, Krang, Bebop and Rocksteady are not in this episode.

Villain: Professor Philo Sopho

Note: Professor Sopho will return in the sixth season the last episode: "Too Hot to Handle"

Note:The second screensaver of the animated series was used beginning on the part of the 4th season from Son of Return of the Fly II to the 7th season ending before Shredder Triumphant!

The Turtles switch sides and discover that the Shredder is the main man behind a ring of cufflink thefts that has suddenly hit New York City.

Title reference: The Big Caper

Villain: Big Louie and Shredder

Note: First appearance of Big Louie.

Note: Tony "The Butcher" Vivaldi appears in the first act but with a different voice. Once Big Louie appears, The Butcher disappears.

Note: Big Louie Will return in the series of the fifth season: "Napoleon Bonafrog: Colossus of the Swamps"

Note: 23 episode with Technodrome in dimension X in season 4 and sideseason Vacation in Europe

Note:The second screensaver of the animated series was used beginning on the part of the 4th season from Son of Return of the Fly II to the 7th season ending before Shredder Triumphant!

When a power surge causes an arcade machine to release Tempestra, It's up to Leonardo to stop her digital wrath before she becomes dangerously powerful.

Note: First appearance of Tempestra.

Note: Shredder, Krang, Bebop and Rocksteady are not in this episode.

Villain: Tempestra

Note: Tempestra Will return in the seventh season the last episode: "Night of the Rogues"

Note:The second screensaver of the animated series was used beginning on the part of the 4th season from Son of Return of the Fly II to the 7th season ending before Shredder Triumphant!

Splinter has suddenly disappeared, and a note left behind from him forces the Turtles to go their separate ways, but one by one, they are captured by Leatherhead and the Rat King.

Note: Shredder, Krang, Bebop and Rocksteady are not in this episode.

Villains: Leatherhead and the Rat King

Note: As in earlier series after Rat King: "Were-Rats from Channel 6"

Note: Rat King Will return in the series of the fifth season: "Donatello's Duplicate"

Note: As in earlier series after Rat King and Leatherhead in the third season: "Leatherhead Meets the Rat King"

Note: Leatherhead Will return in the seventh season the last episode: "Night of the Rogues"

Note:The second screensaver of the animated series was used beginning on the part of the 4th season from Son of Return of the Fly II to the 7th season ending before Shredder Triumphant!

A machine called the Transmogrifier causes Raphael and a cab driver to swap bodies, and it is later discovered that a defect in that same small device could do some very big damage to the city if activated.

Note: Shredder, Krang, Bebop and Rocksteady are not in this episode.

Villain: Mr. Big

Note: Master Splinter is not in this episode.

Note:The second screensaver of the animated series was used beginning on the part of the 4th season from Son of Return of the Fly II to the 7th season ending before Shredder Triumphant!

Gadget Man comes out of retirement after 50 years, but is tricked by Shredder into fighting against the Turtles.

Villain: Shredder

Title Reference: King for a Day

Note: 10 episode with Technodrome in dimension X in season 4 and sideseason Vacation in Europe

Note: The first screensaver of the animated series was extended from the 1st to the 4th part of the season and sideseason in vacation in Europe

While trying to contact the Turtle Nebula, Donatello meets an intelligent lizard alien named Algernon ("Algae" for short), who must help him and the other Turtles rescue April from a greedy man named Hostile Hiram Grelch.

Note: Shredder, Krang, Bebop and Rocksteady are not in this episode.

Villain: Hostile Hiram Grelch

Note:The second screensaver of the animated series was used beginning on the part of the 4th season from Son of Return of the Fly II to the 7th season ending before Shredder Triumphant!

A failed mutagen experiment results in an invasion of giant insects and arachnids in New York City.

Villain: Shredder

Note: Final appearance of Metalhead.

Note: 24 episode with Technodrome in dimension X in season 4 and sideseason Vacation in Europe

Note:The second screensaver of the animated series was used beginning on the part of the 4th season from Son of Return of the Fly II to the 7th season ending before Shredder Triumphant!

A Foot Soldier named Alpha-1 has his intelligence increased, but it results in a Foot Soldier rebellion against Shredder and Krang and the duos exile from the Technodrome.

Villain: Alpha-1

Note: 25 episode with Technodrome in dimension X in season 4 and sideseason Vacation in Europe

Note:The second screensaver of the animated series was used beginning on the part of the 4th season from Son of Return of the Fly II to the 7th season ending before Shredder Triumphant!

While helping April investigate a report of giant monsters attacking a superstitious farming village, Leonardo is mistaken for an alien from another planet. The lone Turtle must avoid being hunted down into extinction while also trying to rescue April from a mad scientist.

Note: Shredder, Krang, Bebop and Rocksteady are absent in this episode.

Villain: Dr. Davens

Note: This is the last episode while the live action movie was being made.

Note:The second screensaver of the animated series was used beginning on the part of the 4th season from Son of Return of the Fly II to the 7th season ending before Shredder Triumphant!

The Turtles travel to a FairyTale Dimension in an attempt to save the city from Shredder's Docilizer, while also making friends with a local citizen of that dimension, Hokum Hare (based on the Hare character from "The Tortoise and the Hare").

Note: Master Splinter is not in this episode.

Villain: Shredder

Note: First Appearance of Hokum Hare.

Title Reference: The Tortoise and the Hare

Note: 12 episode with Technodrome in dimension X in season 4 and sideseason Vacation in Europe

Note: The first screensaver of the animated series was extended from the 1st to the 4th part of the season and sideseason in vacation in Europe

Set up as a follow-up episode, Hokum Hare and the Turtles hitch a ride on a time-traveling train to 2036, where they discover that Shredder has plans for the future New York City. Ultimately, the Turtles of both the past and the future must team up to thwart Shredder before his actions cause all of time to be destroyed.

Villain: Shredder

Note: Final Appearance of Hokum Hare.

Title Reference: Once upon a time

Note: Final episode to be aired in Syndication.

Note: 13 episode with Technodrome in dimension X in season 4 and sideseason Vacation in Europe

Note: The first screensaver of the animated series was extended from the 1st to the 4th part of the season and sideseason in vacation in Europe