Season 4

The Turtles experience outer space and alien life for the first time.

The Turtles and their enemy crash-land on an ice moon and they must put aside their differences in order to survive.

Casey releases a wish-granting alien named Wyrm, who wants his freedom to do whatever he wants to the universe

A shark-like bounty hunter is hired by Lord Dregg to destroy the turtles, who choose to hide out in an abandoned space station.

The team must journey through an ancient alien temple to get a piece of the black hole generator.But they get an ancient star which marks the Aeons

When microscopic aliens invade Mikey's mind, the Turtles have to chase them through the strange world of Mikey's subconscious.

The turtles are captured and thrown into the Triceratons' battle area.

The Turtles must gain the trust of the Utrom Council in order to find the next piece of the black hole generator.

The Turtles journey through an ocean-like area of space.

The Turtles are transported to another dimension where they meet their 1980s counterparts and work together to battle Krang.

Donatello is feeling inferior to Fugitoid, but his intellect is put to the test when the Triceratons attack.

When Raphael loses his fighting mojo, he must overcome his feelings to save his brothers from certain doom.

The team must overcome impossible odds in order to obtain the final Black Hole Generator piece that is located on the planet Magdomar.

As the team finally reaches Earth, the Fugitoid reveals a horrible secret about his past.

April faces a deadly, new enemy when she graduates to full Kunoichi; the Turtles must deal with the return of some old foes.

When Leonardo secretly allies himself with Karai, he gets himself into deeper danger than he could have realized.

Raphael must overcome his fear of insects to lead the team when they are forced to battle Stockman-Fly's new insect minions.

Don Vizioso's gang tracks the Turtles with a slew of Anti-Mutant weapons.

Michelangelo befriends some odd, new superheroes named Wingnut and Screwloose.

For the first time, the Turtles encounter something they cannot defeat – the Super Shredder!

The Turtle team hunts for their Sensei, but soon realizes they are being hunted as well.

Donatello becomes concerned and decides to test April, only to discover that her psychic abilities are rapidly growing in power.

When Tokka returns after her presumable death, she finds out that her baby has been taken from her. After realizing this she violently searches for her lost baby.

A dangerous female mutant, by the name of Alopex, appears with a personal vendetta against Tiger Claw. The Turtles, April and Casey try to befriend her, but turns on them and furiously goes after Tiger Claw alone. Unfortunately for her, Tiger Claw has prepared for her unexpected arrival.

Super Shredder has returned with even greater vengeance, forcing the Turtles to enlist the combined aid of Splinter, April, Casey, Karai, Shinigami and the Mighty Mutanimals to destroy him once and for all.

With the demise of their beloved father and Karai incapacitated, the Turtles, April, and Casey, infiltrate Super Shredder's new lair to put an end to Oroku Saki once and for all, no matter what it takes.