It is February 29th, Martin Anderson's first true birthday in four years. However, things take a turn for the worst when almost nobody shows up for the party due to sudden friendship terminations, all taking place at the same time. Lenny Leggo sets out to resolve the issue, only the find out that he himself is just as big of a problem as everyone else.
When Lenny holds the gang's annual 4th of July pool party at his house, all seems to go great, until one of Jonah Flenderson's fireworks explodes while he shows it off to everyone. When a nearby house explodes merely seconds later, Lenny and Jonah are left to believe they're at fault.
Martin's car burns up after he bakes cookies on the dashboard of his car, so he plans to buy another used car. However, he also becomes tempted to use this as a prime opportunity to buy a sports car, in an effort to win back his ex-girlfriend from his highschool's quarterback.
Lenny becomes horrified after he forgets that Katrina's birthday is only two days away and hasn't gotten a gift for her. Desperate, he'll do anything to make sure she has a gift just in time for her birthday....even if it means risking his life.