Pammie Goodwin's pet rabbit, Cleo, accidentally swallows one of Martin's vitamins, which causes Chloe to grow into a monster rabbit. Martin has to figure out how to restore Cleo. In the meantime, it's a tough job to hide a 6-foot tall rabbit, one with a 6-foot tall rabbit appetite, from the searching Pammie, Mrs. Brown and Det. Brennan. Before Martin can give Cleo the antidote he concocts, Cleo ingratiates her way into Mrs. Brown's masquerade party, and has such a good time, she doesn't want to take the antidote to become a regular rabbit again. Martin secretly slips Cleo the antidote just in time.
—Huggo