Whirling Derfish is episode 29 of Round The Twist.
It's the annual Junior Wharf to Surf race, and Pete is determined to beat James for once. When Bronson accidentally swallows a rare whirling derfish, its spinning motion gives him a propeller that lets him speed through the water. But there are only two derfish left in the world, and the species is in danger of extinction if the pair can't be reunited. After finding it in Linda's room Fay reads to Tony from the Viking Book of Love.
- Andrew Gilbert as Tony Twist
- Rian McLean as Pete Twist
- Ebonnie Masini as Linda Twist
- Mathew Waters as Bronson Twist
- Trudy Hellier as Fay James
- Marion Heathfield as Helen Rickards
- Mark Mitchell as Harold Gribble
- Christine Keogh as Cecilia Gribble
- Brook Rowan as James Gribble
- Tom Budge as Tiger Gleeson
- Samuel Marsland as Rabbit
- Katie Barnes as Fiona Richmond
- Rueben Liversidge as Anthony
- Rachael Maza as Genevieve
- Fiona Harris as Reporter
- Clayton Jacobson as Guard
- Phillipa Cahill as Newspaper Girl
- When Pete tries to get up while being tied up, a hand is briefly seen pushing him up.