Billie and Justin must work together to undo a spell when Billie's prank goes awry. Roman gains muscles thanks to a magical muscle tee. Milo's class pet gets loose in the house.

When her spell to remove Justin's wisdom teeth also removes all of his wisdom by mistake, Billie is left watching out for a reckless Justin.

When Billie can't join Roman and Winter's team for a robotics competition, she enlists Milo and uses magic to design an over-the-top robot of their own with disastrous results.