Tink is delighted when Happi drinks too much youngenberry juice, causing him to stop being his usual worrisome self and instead embark on risky gumbling shenanigans. But when Happi begins to get out of control, the other Gumbles must return him back to normal before he puts them all in danger.

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.