Wunderpants is the eighth episode of Round The Twist.
Pete puts his underpants in the microwave to dry them, and is surprised to find that they suddenly provide him with incredible strength and speed... until he goes for a swim and they start to shrink. Meanwhile, Tiger has organised a frog race, but Gribble's toad, Mugger, seems set to eat all the other contestants. Pete arrives late with Loopy Leaper, Bronson's pet frog equipped with the now tiny underpants.
- Richard Moir as Tony Twist
- Sam Vandenberg as Pete Twist
- Tamsin West as Linda Twist
- Rodney McLennan as Bronson Twist
- Robyn Gibbes as Fay James
- Frankie J. Holden as Harold Gribble
- Lachlan Jeffrey as James Gribble
- Cameron Nugent as Tiger Gleeson
- Stuart Atkin as Rabbit
- Daisy Cameron as Fiona Richmond
- Esben Storm as Ralph Snapper
- Justin Connor as Hugh Townsend
- Lauren Taylor as Jill
- Takahito Masuda as Japanese Developer
- Akira Taguchi as Japanese Developer
- Eamonn Kelly as Foxy
- Warren Parrot as Sports Boy
- Adam Hobson as Sports Boy
- Bronson Shelton as Extra
- Based on the short story of the same name from Unreal!.