When the villainous Mr. Wink and Mr. Fibb extend the adult swimtime to extreme lengths at the neighborhood pool, the Kids Next Door plan to strike back with a vengeance.
A little kid named Kenny takes Chimpy to Professor XXXL's lab. While the Professor suspects Kenny will knock open the mysterious disease containers, it is actually Chimpy who causes the havoc.
The Kids Next Door attempts to stop a birthday party for their arch-enemies, the Delightful Children From Down The Lane. But a surprise, and a monstrous guest stands between them and the greatest birthday cake ever.
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