Miles and Merc demonstrate the chain reaction Exo-Flex course to their friends - Blastastic!\rbr\rbrWelcome to the official Disney Junior UK YouTube channel! Disney Junior is the place where magical storytelling comes to life. Watch clips and get ready to sing-a-long to songs from your little ones favourite shows including Doc McStuffins, Sofia The First, Lion Guard, Captain Jake and the Never Land Pirates, Miles From Tomorrow, Mickey Mouse Clubhouse, Henry Hugglemonster, Sheriff Callie and Minnies Bow-Toons.