Teenage Mutant Ninja Turtles - Season 4 (2005)

Dragon's Brew: Hun's taking the Purple Dragons to new heights. He hijacks a top secret government shipment... one of Bishop's little surprises.

Bishop's Slayer returns in a new form.

Grudge Match: Mikey's blowing off trainings more than ever; he's the BattleNexus Champion, after all! Who needs training?

Wing and a Prayer: It's a bird! It's a plane! Okay, it's this guy with angel wings, an Avian, named Raptarr who is after this other guy with metal wings, named Mephos, who wants to take over the Avians' flying city.

Everything that can possibly go wrong for the turtles, does go wrong for the turtles.

Agent Bishop launches a plan to get the President on his side, by making the Turtles look like alien invaders.

Leonardo goes with Casey to put an end to Hun's plans to bring the Purple Dragons to glory. But can both control their anger and succeed in their mission?

Vigilante cop Nobody enlists the help of the Turtles to protect a witness and take down the leader of the Turks, a violent new street gang.

On Halloween night, a hideous six-armed idol is used to invoke a horde of imps and their master, The King of Thieves.

Usagi Yojimbo visits Leo to counsel him. He brings an unruly friend with him - and an assassin.

The Ancient One: It is time for Leonardo to move on. Splinter sends Leo to a new sensei ... or rather, a very old sensei. The journey is long and perilous. Can Leonardo look into himself and find the right answers to his questions?

While Leonardo trains with the Ancient One in Japan, Karai goes after the remaining Turtles and Splinter who must defend their home from Foot Ninja without Leo's help.

Leonardo returns from Japan to wreak vengeance on the Foot and Karai.

Outbreak: Something is growing and spreading in the sewers and the waterways.The remnants of Bishop's 'aliens' have infected various animals, mutating them into horrible beasts ravenous for anything that gets in their way... including turtles.

The Trouble With Augie: April receives a message from her long, lost Uncle Augie ... who's trapped in another dimension.

Stockman finally succeeds in cloning himself a new body, or so he thinks. Something has gone horribly wrong and his new body soon begins to decay. Losing both his mind and body, Stockman goes after April O'Neil in revenge.

The Return of Savanti Romero: Part 1: Evil demon sorcerer Savanti Romero is back! Back in time, that is - he's stuck in the Jurassic period, but is causing trouble for the Turtles in the present day.

The Return of Savanti Romero: Part 2: Evil demon sorcerer Savanti Romero has lured the Turtles back to the Jurassic period to exact his revenge, as well as get his hands on the Time Sceptre.

The turtles are cleaning up their new lair. Donatello shorts out a circuit breaker. Michelangelo begins to flip out, but Splinter suggests telling stories. Leo relays a story that the Ancient One told him at the end of S4E14.

Donatello starts to undergo a horrifying mutation after his previous encounter with Bishop's mutants. The Turtles place him in April and Casey's care but unknowingly put the pair in danger.

Leo, Mikey, Raph, Splinter, and Leatherhead are desperate in curing Donny. Their only choice is to make a deal with the devil (Bishop himself).

The TMNT return to New York to retrieve a pendant that Bishop wants in exchange for Donatello's cure. And it's under the ownership of the New Shredder, Karai.

The turtles are sick of being stuck inside their lair and decide to go out and enjoy the night, but they are approached by strange warriors who make the night a little more interesting.