As punishment for a prank, Moseby cancels the prom. Not prepared to let something like that spoil their fun, Zack plans to hold a secret prom. Bailey is desperate to be prom queen.
Woody accidentally releases a crate of snakes on the boat, and it's up to him and London to track them all down.
Maya accepts a Peace Corps assignment and breaks up with Zack; Cody and Bailey worry about their future together; the gang realizes they will always be friends.