An unsuspecting audience member gets to meet her heroes. There's a gripping new game called Hang On. Someone has the luckiest day of their life, and Yes Lad are in the studio to join in the fun and play their latest hit.
X Factor winner Matt Terry joins in the fun and plays his latest track. Cel Spellman gives the boys cold feet and CBBC's Lindsey and Karim team up to race Sam and Mark in a soapbox derby.
Sam Nixon and Mark Rhodes host the fun in their entertainment show. Callum Beattie joins them in the studio to play his latest hit. CBBC's Katie Thistleton is pranked in her own home and one unsuspecting audience member tries his hand at being a secret agent, in an attempt to win some top prizes.
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.
Lauren Layfield becomes a trainee agent and goes in Yer House. HRVY joins the boys in the studio to perform his latest hit and take on the Selfie Stick Challenge. There'll be more eggy parents and another game of Karasoake.
Boy band RoadTrip surprise a fan in the studio and perform their latest hit. The boys go In Yer House to carry out another undercover mission in a viewer's home. Ben Shires has a disgusting challenge for Sam and Mark as the Celeb of Doom, and there's more singing and soaking in Karasoake.
Ian Stirling and Ben Shires face Sam and Mark in a rollercoaster challenge. Plus a football fan is given the chance to win a stash of prizes and four more parents warble a wet tune in Karasoake.
Boyband New Hope Club surprise two of their biggest fans in the studio and play their latest hit. Blue Peter's Radzi takes on the role of secret agent and goes 'In Yer House'.
When someone forgets to book the studio audience, Sam and Mark are left with time on their hands to reminisce over some of the highlights of the current series. It's been emotional.
