Summary: Join Sam and Mark for more hilarious pranks and festive surprises. There are brand new games and fantastic guests, including Kimberly Wyatt and Hacker T Dog.

Summary: HRVY makes a surprise appearance to give a superfan the surprise of her life! Stars of Operation Ouch the van Tulleken twins go undercover in a viewer's house to carry out secret medical missions. There's a game of Karasoake, and Ben Shires takes questions and selfies from the audience.

Summary: Star of Strictly Come Dancing AJ Pritchard gives one girl the surprise of her life in the studio. Two stars of Coronation Street go head to head with Sam and Mark in Face Off

Summary: Art Ninja Ricky Martin goes In Yer House to carry out a secret mission. Lindsey Russell surprises a superfan in the studio, plus there’s music from Madagascar - The Musical!

Summary: Union J star Jaymi Hensley takes on a risky mission in the home of a big fan. A member of the studio audience is surprised by one of her heroes from CBBC drama The Worst Witch.

Summary: Dengineers stars Joe and Lauren take on a clowning challenge against Sam and Mark.

Summary: Rak-Su take on Sam and Mark in the most physically demanding Face Off yet.

Summary: Star of Hetty Feather, Polly Allen, takes on five missions in the home of one of her biggest fans. Millie Innes of Millie Inbetween surprises a member of the studio audience.

Summary: Pop duo Max and Harvey surprise a superfan in the studio and provide the music. Melvin Odoom and Rickie Haywood-Williams take on Sam and Mark in a radio Face-Off challenge.

Summary: Stars of The Dumping Ground join the boys to surprise their fans in the studio. Naomi Wilkinson has a total disaster in this week’s In Yer House. There’s more super wet singing in Karasoake and HRVY performs I Don’t Think About You.

Summary: Someone gets a chance to win some prizes that are out of this world! Bars and Melody take questions and selfies from the audience and there’s music from Samantha Harvey.