Sam & Mark's Big Friday Wind-Up (also called Sam & Mark's Big Wind-Up for repeat compilations featuring just the pranks and Sam & Mark's Big Christmas Wind-Up for Christmas specials) is a British children's entertainment series aired on the CBBC Channel since 16 September 2011. It is presented by Sam & Mark. It is effectively the replacement for TMi (later known as Sam & Mark's TMi Friday). A fifth series started airing from 18 December 2015, and a sixth series began airing from 16 December 2016 and finished on 31 March 2017. A seventh series began airing in January 2018.