April's Aunt Aggie returns to help the turtles stop a mad scientist from using a doomsday device to ransom the world.
Tropes
- Dismantled MacGuffin: The Doomsday Device in the episode was dismantled, von Volt having all but one piece needed to use it.
- Mad Scientist: Vilmutt von Volt is the episode's villain of the week, having stolen the last piece of the Doomsday Device for his own ends.
