Episode 2.1 “Invasion of the Squirrelanoids” No description available, but expect some sort of invasion of mutant squirrels.
Episode 2.1 “The Mutation Situation” The Turtles find out that alien Kraang has dropped mutagen canisters all over New York. Throughout season 2, the heroes will have to recover those canisters before more mutants are created.
Episode 26: Showdown Part 2 The Turtles must save April and stop The Kraang from destroying Earth with their new destructive weapon, The Technodrome.
Episode 24: Operation: Break Out Donatello rescues Kirby by breaking into a secret prison, but getting out proves more difficult.
Episode 20 – Enemy of My Enemy Karai wants an alliance with the turtles, hoping their combined strength can defeat the Kraang.