Nickelodeon Season 2 – Episode 05 (Mikey Gets Shellacne)

Episode 2.5 “Mikey Gets Shellacne” Michelangelo plays with some of Donatello’s recent batch of retro mutagen, which contracts a dangerous infection that mutates out of control.

Nickelodeon Season 2 – Episode 04 (Mutagen Man Unleashed)

Episode 2.4 “Mutagen Man Unleashed” Donatello obsessively experiments with mutagen in a bid to find a cure for April’s mutated father. Unfortunately this puts April in danger from a new threat–Mutagen Man!

Nickelodeon Season 2 – Episode 03 (Follow the Leader)

Episode 2.3 “Follow the Leader” When the Turtles face Shredder’s newest threat, an army of Robot Foot Soldiers, Karai captures Leonardo and forces him to do battle with these new and improved ninjas that can adapt to his every move.

Nickelodeon Season 2 – Episode 02 (Invasion of The Squirrelanoids)

Episode 2.1 “Invasion of the Squirrelanoids” No description available, but expect some sort of invasion of mutant squirrels.