Just as cruise ship water parks continue to get bigger and bolder, so too do the stage shows. Full-scale productions, from family-friendly Disney fare to rock-fuled jukebox musicals to nostalgia-inducing revues, are staged in main theaters from a wide variety of lines. These Broadway-style shows feature costumes and special effects that you'd expect to see on land in New York or London, and also incorporate high-tech elements and impressive acrobatics to keep you on the edge of your seat. Check out these 9 extravaganzas at sea.