The Grim Adventures of Billy and Mandy Wiki
The Grim Adventures of Billy and Mandy Wiki
Beware Of The Undertoad
Beware of the undertoad.png
Series The Grim Adventures of Billy & Mandy
Season 7
Production code 712
Writer Michael Diederich
Broadcast information
Cartoon Network US Premiere March 23, 2007
Paired with Waking Nightmare
Chronological information
Waking Nightmare
Billy & Mandy's Big Boogey Adventure

Beware Of The Undertoad is the 12th episode from season 7 of The Grim Adventures of Billy & Mandy.


When Billy, Mandy and Grim once again go to the beach, Grim warns Billy to avoid swimming too far, because the "undertoad", a frog-like creature, will try to drag him into the sea. Billy encounters the undertoad, and he barely makes it back to the beach. With the dangers of the sea averted, the guys go back home, but the undertoad is set on bringing Billy down, that he follows him to his house. The next day, the undertoad becomes a constant annoyance to Billy, even at school. Grim and Mandy capture the undertoad, and set sail to release him at sea, where they meet the giant Mama undertoad.


  • The undertoad and the giant Mama undertoad looks similar to CatDog's parents from Nickelodeon's cartoon series CatDog, despite the fact that CatDog's mother is a sasquatch and looks a bit different then the Mama undertoad and CatDog's father and the undertoad himself are both frogs.
  • This is the only episode where Irwin, Mindy, Pud'n and Pandora makes cameo apperances but doesn't speak, except for Sperg.


  • Story and Storyboard by: Michael Diederich
  • Directed by: Matt Engstrom & Juli Hashiguchi & Eddy Houchins & Kris Sherwood


  • Principal Goodvibes: A riot on the bus, bringing a dangerous animal to class, the teacher was nearly EATEN!
  • Undertoad (laughs): That's one tough broad.
  • Principal Goodvibes: What do you got to say for yourself?
  • Billy: It's not my fault. It's this stupid undertoad. He's dragging me down man!
  • Principal Goodvibes: (To Billy) I wasn't talking to you.
  • Undertoad: Huh? Oh, yeah. He's guilty. He should be punished severely...
  • Billy: See?!
  • Principal Goodvibes: I'm sending you home a note to your parents young man, and take your frog with you.
  • Undertoad: That's toad.
  • Principal Goodvibes: Or just drop him off in Biology class.

  • Euegne's Mom: Sorry about Eugene. He's new in this. Bye-bye and thanks again.