Hot Rodding Teenagers from Dimension X

Hot Rodding Teenagers from Dimension X is episode number 4 of the 1987 Teenage Mutant Ninja Turtles cartoon series. It is the fourth episode of season 1 (1987). This episode of the show is part of the Heroes in a Half Shell arc. It was written by David Wise and Patti Howeth, and directed by Yoshikatsu Kasai. It originally aired on December 17, 1987, in syndication. It is available on DVD on the box set released on April 20, 2004.

Plot Summary
In the Technodrome deep under New York City, Krang reminds The Shredder that once again he has failed to destroy the TMNT. Krang demands a "body", mentioning his old home, Dimension X - which gives Shredder the idea to open the recently completed "Transdimensional Portal" so that he can retrieve advanced weapons to use against the Turtles. However, when Shredder opens the portal, he lets out three teenage Neutrinos in flying cars, chased by a flying jeep piloted by two of Krang's Stone Warriors. The Neutrinos blast through the Technodrome and escape. Bebop and Rocksteady fire on the Stone Warriors, General Tragg and Lieutenant Granitor, until Shredder establishes that they work for Krang.

Meanwhile, the Turtles and April O'Neil finish rebuilding Baxter Stockman's old van into the "Turtle Van". It has modern equipment that helps the Turtles locate the Technodrome, which is under the World Trade Center. Suddenly, the Neutrinos burst out from a subway station, and the Turtles decide to pursue them, believing them to be Shredder's agents.

The two Stone Warriors, also chasing the Neutrinos, encounter their old master Krang without a body. Krang blames Shredder for releasing the Neutrinos, whom he labels "juvenile delinquents" that hate war and love fun. Shredder gives the Stone Warriors a "Techno-Rover" to aid their chase of the Neutrinos.

Meanwhile on the streets, the Turtles use the Turtle Van's catapult to catch the Neutrinos. When the Turtles discover the Neutrinos do not work for Shredder, they decide to be friends. They all go to "CLOWN TIME FOOD AND GAMES EMPORIUM" for pizza and arcade games, where the Neutrinos describe the war in Dimnesion X. April is worried what else may come from Dimension X.  Suddenly the building is leveled by a missile attack from the Stone Warriors. The Turtles jump inside the Turtle Van, and the Neutrinos jump into the flying cars. As the Neutrinos fire their laser guns at the Stone Warriors, Leonardo leans out the window and slices the Techno-Rover's wheels with his katana. This allows the Turtles, April, and the Neutrinos to escape before the police arrive. The Stone Warriors retreat back to the Technodrome, after releasing a weather satellite that, instead of providing weather prognosis, "makes weather". Within two hours time, the weather satellite will create a devastating storm.

Back in the Turtles' sewer lair, the Neutrinos tell Splinter that Krang was banished from Dimension X, lost his body, and is now just a brain. Splinter and the Turtles conclude that this is the same brain that Michaelangelo encountered when they defeated Baxter Stockman's mousers at the end of the episode A Thing About Rats. Splinter also realizes Shredder has been getting his advanced technology from Dimension X. He fears that Krang will bring his Stone Warriors to Earth. The Neutrinos and the Turtles agree to team up to send Krang and the Stone Warriors back to Dimension X.

Up on the streets, the weather satellite is causing snow in June. The Neutrinos, the Turtles, and April go to the Technodrome, where they find the Transdimensional Portal. The turtles destroy the Foot robots, defeat Bebop and Rocksteady, and send the Stone Warriors through the portal back to Dimension X. The Neutrinos also go home to Dimension X, after giving one of their flying cars (a "star mobile") to the Turtles. The Turtles hurry to the surface to disable the weather satellite. They fly up to it using the star mobile, so that Leonardo can cut the weather satellite in half with his katana, destroying it and saving the city.

Back in the Technodrome, Shredder finally agrees to give Krang a body so Krang himself can destroy the Turtles.

At the Turtles' sewer lair, April reads the story "The Tortoise and the Hare" out loud as Donatello, Michaelangelo, and Raphael drift to sleep. Leonardo enters the room, cleaning his katana, and suggests that they need their rest, vowing to find Shredder on the morrow.