The cast of So Awkward and vlogger Houssein join Yasmin, Jonny and Hacker! But who will get slimed? Max and Harvey are put into detention and Hacker meets the new Doctor Who - Jodie Whittaker. There's cartoon action in new episodes of Dragons: Race to the Edge and the return of Mash-Up favourites Push-Off and How Many Things in the Thing? Also, for the first time on TV, Musical Toilets! It's totally live - so anything can happen!