The Ghastly Danger of the Ghost Dentist is the 35th episode of The Epic Tales of Captain Underpants.
The campers share scary stories with everyone. When it's George and Harold's turn, Mr. Krupp and Melvin are extremely scared. Melvin plots to unleash the ghost of Gumbalina Toothington, a ghost dentist in George and Harold's story that was mentioned by Jessica when she spoke about how bad Other Sophie had brushed at the beginning of the episode.
- Captain Underpants refuses to brush and floss his teeth, but Harold and George tell him he doesn't have a choice because Gumbalina Toothington comments on him saying he's got stinky teeth and bad breath, which causes him having cavities.
- Moral: Never forget to brush & floss after every meal!!
- Captain Underpants cries after Erica's song, but he doesn't turn back into Mr. Krupp from his own tears since they aren't powerful enough changing him back to Mr. Krupp unless there's real water from Gumbalina Toothington's dentist hose.
- It was revealed towards the end of the episode that Gumbalina Toothington was just a good person who wanted everyone's mouths to be healthy.