Teenage Mutant Ninja Turtles (2003): Season 7, Episode 2

7 - 2: Karate Schooled

When the Turtles are reunited with Casey and April, it's smiles all around ... until it becomes clear that Casey's being brainwashed by his new martial arts instructor, Master Khan, a devoted Foot operative. The Turtles must save Casey (and themselves) from this deadly Foot fanatic.