Prince Sanjei comes to the Tipton to be crown king, but when he tells Zack and Cody he wants to try being a regular kid, Cody poses as him, and Zack takes Sanjei to the mall. Meanwhile, London thinks she saw a UFO, so she invites Maddie over to stay up and look for one. Maddie though, is in it just for the free food and service.
Kurt, a rock-musician and the twins father, comes to the Tipton Hotel for a visit. Kurt will allow Zack and Cody do things that Carey would not approve of them doing. Zack decides to leave the Tipton when he gets in an argument with his mother about his homework, by stowing himself in his father's tour bus.
After getting bad grades on his report card, Zack decides that he needs a way to get good grades without having to study. When Bob, a boy with Dyslexia, shows up in his class, Zack decides that he can pretend to have dyslexia so he can have more time on both tests and reading. Meanwhile, London beats Maddie at chess, and soon Maddie becomes obsessed at beating London at chess.
Zack and Cody try to make friends at school. When word gets out that they live at the Tipton, all of the cool kids hang out with them. In the end, the twins find out who there real friends really are. Meanwhile, Carey is practicing dance moves, while London teaches Maddie how to ask Lance out and Maddie tutors London in Math.