Highlights from Sam & Mark's Big Friday Wind-Up, featuring pranks, games and celebrity guests.
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The boys arrange an Olympic-sized prank and are joined by the Sugababes.
The boys go undercover in Bradford and there's music from Six D.
The boys are joined by Joe Swash and there's music from Nicola Roberts.
The boys have a magical surprise for a Merlin fan and there is music from Loick Essien.
The boys prank some CBBC viewers and are joined by Stacey Solomon and Rizzle Kicks.
The boys are bamboozled by some Dynamo magic and there's music from Ronan Parke.
The boys are joined by The Wanted who have a surprise for some fans in the audience.
The boys prank some Doctor Who fans and surprise the audience.
The boys go undercover in London and there's music from Pixie Lott.
The boys are joined by the Saturdays, who have a surprise for someone in the audience.
The boys go undercover in Yorkshire and are joined by dance duo Chris & Wes.
The boys go undercover in Wales, and surprise members of the audience.
The boys go undercover in Altrincham and there's music from Parade.