Trick or Treat

S2, E14: Hacker shows up at Motherboard Control Central. He pleads guilty to being the King of Chaos, but says he's sorry. He doesn't want to be a bad guy anymore. But when nobody's looking, he slips a strange frog into the air duct. What happens when this frog grows into a grotesque, alien creature that threatens to destroy Motherboard? And what will happen to the kids when they go inside Motherboard to track it down?