Take Sam and Mark everywhere in the Go CBBC app
Union J perform on Big Christmas Wind-Up
CBBC stars sing in this Wind-Up sketch
Union J get pranked on Big Christmas Wind-Up
Sam and Mark are trying to impress Cel
Sam & Mark's new show is full of hidden-camera pranks, special guests and surprises. Watch each week to see who is going to get "Smarked" and which family will take home the special prize - either Sam or Mark!