List of Teenage Mutant Ninja Turtles (1987 TV Series) Episodes - Season 4 (1990)

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 return it to Dimension X.

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

When General Tragg and his troops attack the Neutrino capital, the Neutrino leaders, Zenter and 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.

Title Reference: Three Men and a Baby

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

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

The Turtles must contend with the "Phantom of the Floxy" while trying to hinder Shredder's latest plan to bring the Technodrome back to Earth.

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

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.

Title Reference: Back to the Egg

Note: Master Splinter is not in this episode.

Raphael must contend with a mobster named Pinky McFingers when he is kidnapped from a local comedy club. (Baxter Stockman's twin brother Barney's only episode)

Note: Master Splinter is not in this episode.

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

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.

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.

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

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.

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.

Michelangelo must babysit and protect a young rich girl named Buffy, who knows the formula for a super fuel that Krang needs for the Technodrome.

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.

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.

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.

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.

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.

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