The Koopalings switch their bodies after someone presses the switch.
Tropes:
- Big "NO!": Ludwig lets out one of these when he sees himself in Wendy's body.
- "Freaky Friday" Flip: The episode focuses on the Koopalings having their bodies swapped.
- It starts with Ludwig and Larry stepping inside Iggy's new machine, then Bowser Jr. turns the machine on, causing them to swap bodies.
- Later, as Iggy is attempting to fix the machine, Morton and Lemmy decide to look inside. When Iggy and Roy try to get them to leave, Wendy steps in to point out that someone has activated the machine, causing them all to swap bodies too.
- At the end of the episode, when all the Koopalings are back in their normal bodies, we see that Bowser and King Boo have somehow swapped bodies.
- Mass "Oh, Crap!": Iggy, Lemmy, Morton, Roy and Wendy have this reaction when they're inside the machine and Wendy points out that one of them bumped the lever on the front of the machine.
- Voices Are Not Mental: While they're in each other's bodies, the Koopalings speak with the voices that belong to the bodies they are using instead of their own voices.
