|Koopa 1, Koopa 2 and Koopa 3|
Horrid Koopa is Pikachufreak's Friturtoons episode.
The Friturtoons are walked out and so the three Koopas are brought to help out. Unluckily for the Friturtoons, the three koopas are incredibly self-centred and rude; but, of course, they get their comeuppance in due course: Koopa 2 falls off a cliff-face, Koopa 1 is overloaded with flour and Koopa 3 reverses into the sea. Mario is swift to coin the name "the Brothers Grim" for the three.
- US Narrator: Duane Lawrence.
- UK Narrator: Michael Angelis.
- Diddy Kong
- Koopa 1 (made-up Friturtoons character)
- Koopa 2 (made-up Friturtoons character)
- Koopa 3 (made-up Friturtoons character)
- Duck (does not speak)
- Christopher Robin (cameo)
- Donkey Kong (cameo)
- Luigi (cameo)
- Pooh (cameo)
- Mr. Krabs (cameo)
- Walker Boone as Mario
- John Leguizamo as Yoshi
- John Stocker as Toad
- Andrew Sabiston as Diddy Kong
- Ken Sanson as Rabbit
- Harvey Atkin as Koopa 1, Koopa 2 and Koopa 3
- Rodger Bumpass as Squidward