Justin Bieber and Olympic Gold medalist Gabby Douglas appear, Debby Ryan ("Jessie") and Roshon Fegan ("Shake It Up," "Dancing with the Stars") will once again host and platinum recording artist Cher Lloyd and top choreographer Rosero McCoy are set to judge Disney Channel's popular talent competition for kids, "Make Your Mark: Shake It Up Dance Off." The multi-platform TV, online and radio initiative culminates with two special telecasts, including performances by "Austin & Ally" star/Hollywood Records recording artist Ross Lynch and "Shake It Up" stars Bella Thorne and Zendaya, among others.