There’s a war coming… Under the Sea: A Descendants Short Story airs Friday, September 28th on Disney Channel! Subscribe to tvpromosdb on Youtube for more Descendants 3 season 3 promos in HD! Descendants 3 official website: http://disneynow.go.com/ Follow Descendants 3 on Twitter: https://twitter.com/Descendants Follow Descendants 3 on Instagram: https://www.instagram.com/DisneyDescendants » Starring: Dove Cameron, Sofia Carson, Thomas Doherty, China Anne McClain