The Wacky Adventures of Ronald McDonald

Ronald and his friends go on a camping trip in the Far-Flung Forest, where Ronald discovers an old house which he assumes is haunted by a ghost called the Far-Flung Phantom. Due to a sudden bout of stormy weather, the campers are forced to stay in the old house, where a holographic head named Franklin leads them through a challenging game which will eventually help them to escape. Along the way, the Fry Kids and McNuggets get caught in traps and are separated from the group and the rest face off against Franklin in a challenge of riddles. Tika, Hamburglar, and Birdie fail each riddle and are swept into traps, leaving only Ronald, Grimace, and Sundae to solve the final one, which they do. The holographic head turns out to be a child named Franklin programming the game with help from Tika (who wanted to give Ronald a challenge) and the McNuggets in a lab room. After Ronald gets a "You Win" out of Franklin, the scientist Dr. Quizzical returns to catch his son Franklin in the act and releases the others from their traps. Upon the group officially meeting Dr. Quizzical, he states that he had to leave a lecture he was giving early when he saw lightning on the mountain and that Franklin has done something like this before. Franklin apologizes to Ronald and the gang for his actions and is allowed to join their camping trip, becoming their new friend in the process.

Hamburglar tricks the gang into believing that aliens have come to Earth so that he can steal McDonaldland's hamburgers without interference from them, which costs their trust in him when they find out. Later, Hamburglar gets abducted by real aliens after foolishly accepting an offer to go on vacation with them, not realizing until too late that the vacation will end up keeping him away from Earth for thousands of years. Despite being angry at him for his lie and prank, Ronald and his friends go on a mission in outer space to rescue Hamburglar.

Hamburglar is upset that he forgot Ronald's birthday and banned a present for him until an evil mad scientist named Professor Thaddeus J. Pinchworm gives him tickets to a fake amusement park called Birthday World. During their visit, Ronald and his friends quickly become disappointed to find that most of the park's rides are broken and/or malfunctioning; they then ride a roller coaster which turns them into toddlers and babies with a ray. The gang then discovers that they were test subjects for Pinchworm's evil scheme to take over the world by using a bigger version of the ray to de-age the world's population into toddlers and babies. Despite the fact that the de-aging has left their abilities limited, Ronald and his friends set out to stop Pinchworm's scheme and restore themselves to their regular ages.

The gang travels to a Scottish expedition known as Ol’ McDonaldland Loch where Sundae's cousin Scotty lives. They also come across a plot by a mad scientist named Stiles and his assistant Pip's attempt to build a replica of the Loch Ness Monster in order to make money from the discovery. Birdie befriends the real Loch Ness Monster, who is named Simon and wants his existence to be kept a secret. Despite not being good at keeping secrets, Birdie agrees to, but this becomes difficult when Stiles and Pip's scheme goes awry, putting everyone in danger.