Sam and Mark are joined by Saturday Mash Up's Jonny and Yasmin. Naomi Wilkinson and Ed Petrie challenge them to take part in a street dance competition, four parents attempt to impress the public with their vocal skills in Karasoake and a huge dinosaur fan has the chance to win some fantastic prizes.

Sam and Mark are joined by Olympic gold medallist Rebecca Adlington, who takes on the selfie-stick challenge in the studio. An unsuspecting audience member meets the life-long hero they never knew they had, and Chris Johnson gets a huge surprise in his own home.

Shelby Bain, who plays Amy in The Next Step, joins the boys to surprise a superfan in the studio. Celebrity MasterChef winner Angellica Bell is the Celeb of Doom, and eight more parents are challenged to Hang On.