Raven Baxter is stuck in Boston, where she has a vision that something bad will happen to Cody. After warning him, vaguely, he becomes paranoid. Meanwhile, Maddie tries to get London into wearing Raven's dress, but London is too stuck up to do so, until pop star Hannah Montana arrives at the Tipton, and wants to wear the dress herself.

The crossover starts on That's So Raven S04E11 Checkin' Out (I). It continues on Hannah Montana S01E12 On the Road Again (III)

It's International Day at Zack and Cody's school and Zack decides to ask a guest named Kumiko, a Japanese opera singer, to be his project. After Zack loses Kumiko, Carey and the boys must fill in as Japanese singers for a convention being held at the Tipton. Meanwhile, Maddie and London get trapped in London's closet.

Zack and Cody wish for superhero powers when they see a shooting star. Their wish comes true and they learn that Mr. Moseby is their villain, who wants to turn all kids into miniature adults.