While Maya helps Zack and Woody transfer London's shoes to her shoe submarine, Zack accidentally causes the sub to submerge, trapping them with only 30 minutes of oxygen. In fear that they'll never get out, Maya finally admits that she likes Zack back. Meanwhile, Marcus helps Cody prepare for a big chess match against the junior chess champion of Russia, who happens to be a distractingly beautiful girl named Mischa Matryoshka (Cody Kennedy).
Marcus leaves the ship to do a musical of his song "Retainer Baby". And when Mr. Moseby discovers his new Aqua Lounge flooded, he vows to find the culprit, threatening not only to expel the one responsible, but also throw them off the ship.
Ms. Tutweiller assigns the class to do a play made by Cody, but when Cody assigns Bailey a female role and she learns that the play is based on her breakup with Cody, she wants off the play and Cody must find a replacement.
Zack, Maya, and Cody, Bailey go on a double date and both Maya and Cody find something out about their partners. London thinks there is a dead body in the basement of the ship, and sends Woody down with her cell phone to take a picture. Woody goes down and looses London's phone, then realizes there are snakes in a big crate on board. The snakes get loose.