On his way home from getting pizza, Raphael and a cab driver accidentally get exposed to rays from a personality transmogrifier. This device switches the minds of the two parties that get zapped by it. When the device goes off, Raphael's mind gets switched with the cab driver's.
The Transmogrifier was accidentally left in the cab by Little Huey, one of Mr. Big's thugs. Mr. Big had Little Huey steal the device so he could use it on the Premier of Vadeem and Little Huey. Once their minds are switched, he is going to have the Premier sign over the valuable oil leases to him.
When Mr. Big finds out that Little Huey lost the Transmogrifier, they both set out to find it.
Meanwhile, the other Turtles are startled when a cab driver shows up with their pizzas insisting that he's Raphael. Since the man seems to know a lot about the Turtles, Michaelangelo, Donatello and Leonardo decide to have him stay for a while. While all of them are watching the news, they discover that a Transmogrifier was stolen from the Meridian Vine Instititue. The professor on the TV says that once this device has been activated, it will become unstable and blow up. Michaelangelo, Leonardo and Donatello now realize what has happened to Raphael. The four set out to the Institute to find the blue prints for the Transmogrifier so that Donatello can deactivate it.
Mr. Big and Little Huey find the cab that Huey was in. They get in and discover that the device is still there. Now that they have it back, the hoods tell the driver to take them to Pier 53. This is where the Premier will be.
While April is on her way to interview the Premier, she spots Raphael driving the cab that Mr. Big and Little Huey are in. April tries to talk to him, but the driver thinks she's nuts when she call him Raphael. Sensing that there is something wrong, Ms. O'Neil contacts the Turtles. The Turtles tell her that they're on their way and ask her to follow the cab. The cab arrives at Pier 53 and Mr. Big and Little Huey kidnap the Premier. The mobsters then tell the driver to take them to Mr. Big's hideout.
Now the chase begins. April is still following the cab and informs the Turtles of their whereabouts. The Turtles decide to take a route to try to cut them off. They all come together unexpectedly at an intersection and the taxi and the Turtle Van collide. The impact crushes the Transmogrifier, causing it to go off. Seconds later, Raphael and the cab driver are returned to themselves.
Mr. Big and Little Huey get arrested. April ends up getting her interview with the Premier, the cab driver gets a medal for saving the Premier and the Turtles return home with the real Raphael.
- Leonardo (Cam Clarke)
- Donatello (Barry Gordon)
- Michelangelo (Townsend Coleman)
- Raphael (Rob Paulsen)
- Splinter (Peter Renaday)
- April O'Neil (Renae Jacobs)
- Burne Thompson (Pat Fraley)
- Oscar (Peter Renaday)
- Mr. Big (Barry Gordon)
- Little Huey (Pat Fraley)
- Premier of Vadeem (Pat Fraley)
- Mayor (Rob Paulsen)
- Professor (Rob Paulsen)
- Angry Truck Driver (Townsend Coleman)
- Clothes Guy (Cam Clarke)
- Turtle Communicators
Home media releases
- Teenage Mutant Ninja Turtles Season 4
- Teenage Mutant Ninja Turtles: The Complete Classic Series Collection
- When Raphael (in Oscar's body) is buried under a pile of pizza boxes, a green three-fingered hand can be seen peeking out.
- When Oscar (in Raphael's body) first encounters April, there is no one else drawn inside the cab.
- The local movie theatre shows Slime Creatures from the Planet Zurp.