Harold intends to cut down the forest, replacing it with plastic trees in the lobby of the new casino he hopes to build. The only thing standing in his way is Nell's claim that the forest is home to yuckles, a rare breed of mushroom.
When Nell sprains her ankle, it's up to Pete, Linda and Bronson to find proof that yuckles actually exist, which isn't easy since the yuckles like to disguise themselves as other objects before exploding.
- Richard Moir as Tony Twist
- Ben Thomas as Pete Twist
- Joelene Crnogorac as Linda Twist
- Jeffrey Walker as Bronson Twist
- Robyn Gibbes as Fay James
- Bunney Brooke as Helen Rickards
- Mark Mitchell as Harold Gribble
- Jan Friedl as Cecilia Gribble
- Richard E. Young as James Gribble
- Nick Mitchell as Tiger Gleeson
- Drew Campbell as Rabbit
- Zeta Briggs as Fiona Richmond
- Esben Storm as Ralph Snapper
- Andrew Daddo as Ghost Matthew
- Neill Gladwin as Ghost Jeremiah
- Di O'Connor as Mayor
- Paul Jennings as Professor Yuckle
- Based on the short story "Yuggles" from Unbearable!.