Episode 6

S1 E6: While escaping the Numemon who attacked the group in the sewers on their way out of the factory, the kids are split up and Mimi ends up in Toy Town after being attacked by a Monzaemon. There she finds the other kids acting strangely. Palmon manages to digivolve into Togemon and destroys the Black Gear that was controlling Monzaemon.