3x19: Turtles in Time
When the Turtles are whisked through time by apprentice Time Master Renet, they all must work together to defeat the evil Time Master Savanti Romero.
3x20: Tale of the Yokai
When the Turtles are accidentally transported to the past, they happen to cross paths with a familiar ninja clan.
3x21: Attack of the Mega Shredder!
Leonardo decides to sneak into Shredder’s lair alone, and winds up facing the biggest mutant threat yet.