Slow Plums and Krenits

Auntie First and Loopy are both swindled into getting the Ultimate Defensive Beasts: Krenits, thus both of their populaces had to remain perfectly still or be eaten by the monsters. Russel goes to get the Ultimate Offensive Beast, the Ippy Clippy, to get rid of them, but Bob beats them to the pumch and they are locked in the Wall Eye (where the Ippy Clippy had been stored by Great Great Uncle Zeb) with a flotilla of monster guppies.

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S02E08 - Return of the Moon