The Gum-Leaf War is the sixth episode of Round The Twist.
After an accident, Linda ends up with a broken nose. She dreams of her nose being big, so she escapes to the country with her Aunt Tuneless, where she discovers that anyone who plays The Wild Colonial Boy on a gum-leaf from a certain tree can pass any illnesses onto others.
- Richard Moir as Tony Twist
- Sam Vandenberg as Pete Twist
- Tamsin West as Linda Twist
- Rodney McLennan as Bronson Twist
- Bunney Brooke as Helen Rickards / Aunt Tuneless
- Frankie J. Holden as Harold Gribble / Foxy
- Judith McGrath as Cecilia Gribble
- Lachlan Jeffrey as Foxy Junior
- Justin Connor as Hugh Townsend
- Robert Wallace as Surgeon / Park Ranger
- Based on the short story of the same name from Unbelievable!.