Watching and rewatching Disney Channel Original Movies growing up, you probably think you know them backward and forward. But do you really? Sure, you know the main characters in films — Zac Efron in High School Musical, Kimberly J. Brown in Halloweentown — but what about celebs you might have forgotten were once in Disney Channel films? (Besides Kristen Stewart in The Thirteenth Year, of course.)

In honor of Disney Channel's huge movie marathon that starts today (May 27) and goes through the month of June, see how much you actually remember about your favorite DCOMs.