Sue wishes for a big birthday bash for her Leap Year birthday. Meanwhile, Frankie learns that Mike has been taking care of a stray cat, Brick develops a crush at school, and Axl becomes fascinated with vacuuming.
Frankie's sister (Molly Shannon) offers to help at the house while Frankie studies for her finals for dental-assistant school; Axl tries not to act jealous when Cassidy's ex-boyfriend visits.