Sam and Mark's Big Friday Wind-Up

A festive episode, packed with Christmas surprises. Imperial stormtroopers from the latest Star Wars movie invade the studio to surprise a fan. The audience take on an extremely soggy singing challenge in Karasnowke, embarrassing parents are banished to the School of Shame and two families go head to head in the ultimate final challenge Ball Fall. The Vamps play their latest hit in the studio.

Tom Fletcher joins Sam and Mark in the studio to kick off the 2017 series. There's the world's wettest singing contest 'Karasoake', punishment for embarrassing parents at the 'School of Shame' and chart-toppers Ward Thomas perform in the studio.

Stars of The Dumping Ground surprise two of their superfans. Sam and Mark go undercover in In Yer House Extreme and there's music from boy band Union J.

Comedian and presenter Iain Stirling and Californian boy band The Tide join Sam and Mark in the studio to kick off the weekend. The boys take on two Olympians in a 'Face Off' challenge, and who will survive the avalanche in Ball Fall?

Sam and Mark are joined by Matilda Ramsay as she takes a turn on the Wind-Up Wheel. Two sets of twins from the same family take on each other to win a stash of prizes, and there is music from Gavin James.

Wrestling star Nikki Bella surprises her biggest fan in the studio, Johnny and Inel take on Sam and Mark in a singing challenge and Eurovision performers, Joe and Jake, perform their latest song.

Sam and Mark kick off the weekend with another show packed full of surprises and pranks. Five more embarrassing parents get the School of Shame treatment and The Voice winner Kevin Simm performs in the studio.

Hacker T dog and Simeon Qsyea from Taking the Next Step join the boys in the studio to surprise their biggest fans. Sam and Mark take on Jedward in Newcastle for a comedy challenge and there's music from X Factor winner Ben Haenow.

Wolfblood's Leona Vaughan joins Sam and Mark in the studio. There is also music from singing sensations Collabro, and the boys embark on their toughest In Yer House challenge yet.

Olympic medallists Beth Tweddle and Nile Wilson join the boys for more surprises and weekend wind-ups. A Beyonce fan takes to the air to win a fantastic prize, parents get wet in Karasoake and Bars and Melody perform their latest hit.

Sam and Mark visit a relationship counsellor who encourages them to look back on some of their happiest times together from the series. Featuring plenty of wind-ups, laughter and music to kick-off the weekend.