In this popular Disney Channel series, the globe-trotting Martin twins -- Zack (Dylan Sprouse) and Cody (Cole Sprouse) -- are up to a boatload of high jinks on the high seas, along with their gal pals London Tipton (Brenda Strong) and Bailey Pickett (Debby Ryan). While spending a semester studying aboard a luxury liner, the kids dock at exotic locales such as Greece and Rome. The stern Mr. Moseby (Phill Lewis) is on hand to chaperone.