Don't Have a Cow (That's So Raven)

Raven and Chelsea are the only students in their class not invited to Alana's Halloween party because of Raven's bad history with Alana. At the Chill Grill, Victor reveals that Alana's having the party at the restaurant, which Raven knows Alana did to spite her. Chelsea panics after realizing Victor accidentally switched their orders and she was eating a hamburger rather than a veggie burger, breaking her vegetarian commitments.

After finishing his shift, Victor, dressed up as Victor Frankenstein, prepares to go trick-or-treating with Cory, who's wearing a body builder costume. Cory tells Victor that he wants to trick-or-treat with his friends rather than his father. The disappointed Victor allows Cory to go with his friend William, whose costume is a remote control that causes nearby electrical products to malfunction. Tanya, dressed as Igor, cheers Victor up by offering to trick-or-treat with him in Cory's place.

In Raven's room, Chelsea begins wearing a pin button with a cow's face on it out of guilt for eating the burger. She and Raven pass the time by looking inside a trunk filled with paranormal objects that belong to Raven's grandmother. They come across a magical book that contains instructions for a spell that can grant any wish and decide to try casting it to get invited to Alana's party. After placing the necessary ingredients in a cauldron and reading the magic words out loud, they get a call from a hypnotized Alana confirming their invitations. The two then wish to become the most popular girls at the party and to win the costume contest. They fail to notice Chelsea's button fall into the cauldron during their second incantation and go upstairs to prepare their costumes.

While looking for outfits, they began to panic after noticing their ears were shaped like cow ears and they had white tails on their backsides. Eddie comes to the house and offers to take them to the party, but they force him to leave with the spell book as they start mooing sporadically. The two discover that they are turning into cows due to the button's interference with the spell and cannot reverse the process without the book. Raven suggests that they go to the party and get the book back to undo the spell, believing that the students won't question their appearances on Halloween.

Cory and William return to the house empty-handed due to William's costume setting off multiple alarms in the neighborhood. Victor and Tanya arrive back with a bag full of candy and allow the boys to take some of theirs. Cory tells Victor that he misses trick-or-treating with his father and wants to do it with him next year, but Victor takes the two boys out to get some more candy.

At the party, Raven and Chelsea struggle to find Eddie as they continue to become more bovine in their appearances and behavior. When they finally locate Eddie, Chelsea eats the book page they needed to reverse the spell. Alana's friends halt the party to announce the winners of the costume contest. Alana is outraged to learn that she placed second behind Raven and Chelsea. The students applaud Raven and Chelsea, who have completely transformed into Holstein cows and figure they "might as well milk it." It is revealed that the whole night was all a vision that Raven had right before Chelsea ate the burger, allowing her to stop Chelsea from eating meat and prevent her vision from happening.

Back at the house, Victor and Tanya spend their alone time eating their Halloween candy.

Even a decade after its release, "Don't Have a Cow" is considered a Halloween classic, with a number of publications praising the main plot revolving around Raven and Chelsea's cow transformations. MTV named it #1 in their "9 most iconic Disney Channel Halloween episodes" and called it one of the scariest Disney Channel Halloween experiences, stating "When the spin-off series debuts, I seriously hope they remake this episode, because what's more traumatizing than becoming a cow? NOTHING."[1][2] Glamour listed it in their "9 Disney Channel Halloween Episodes to Watch," saying, "All you need to know about the Halloween episode of That's So Raven is that it ends with Raven and Chelsea turning into real-life cows. Like, they grow snouts, moo excessively, and chew cud. If that doesn't explain the high school experience, then what does?"[3]

• "Don't Have a Cow" on IMDb