Saturday Mash-Up

SYNOPSIS

The cast of "The Next Step' are live in the studio all morning, but who will get slimed? Online singing sensation Sapphire performs live, while The Vamps are in detention. Plus Hacker takes a trip to Blackpool to go behind the scenes at `Strictly Come Dancing'. There's cartoon action in two brand new episodes of `Dragons: Race to the Edge" as well as Push Off, Musical Toilets and How Many Things In the Thing.