Merri and Jolli are having a great time playing pranks on (or grubbing) the other Gumbles, but when they push it too far and try to prank the Snikes, they are captured. It's up to Happi, who wrote the book on grubbing, to rescue them with the ultimate prank.

Whilst being held captive by the Bottersnikes, Tink overhears how much the king fears rain. He decides to pretend he has weather prediction powers and predicts a storm in order to trick the Snikes into hiding, leaving the Gumbles to play in peace.

When Willi, tired of not being taken seriously, discovers that a heroic Gumble captured years earlier may still be being held under Snike Hill, he launches an ill-fated solo rescue mission.