When members of the boys' swim team at Halo Nightly's school keep disappearing, Halo uses her special candy to turn into various underwater fauna to defeat the deadly mermaid that lives in a cave connected to the school swimming pool.
When twins Eek and Ack, from the Great Goo Galaxy, devise a plan to conquer Earth, they get trapped on an asteroid and must deal with something very sticky.
Gabby's pet monster, Dwight, wants to participate in a spelling bee but, unfortunately, no one understands him. Dwight has no luck with speech therapy but he could use an interpreter if only Vice Principal Burns would approve.
The Incredible Rockhead engages in the ultimate game of "Rock, paper, scissors" when Papercut, an enemy designed to defeat him, shows up at his school.
Rockhead joins forces with Scissorlegz when the General kidnaps the girl Rockhead likes and threatens to make her his newest mutant test subject unless Rockhead shows up to rescue her.
Gabby and her pet monster, Dwight, hatch a plan to save the school lunch program, but their efforts are disrupted when another student and his own beastly friend become their competition.
