Line of Duty will be lighthearted for one night only when it films a mini-episode for Sports Relief, which runs from March 9 to 13.
The crime drama returns for a new series later this year but before that, the cast will perform in a live sketch for the charity telethon on BBC One, with series regulars Detective Constable Kate Fleming, Superintendent Ted Hastings, Detective Sergeant Steve Arnott, as you have not seen them before.
In the sketch, DS Arnott (Martin Compston), DI Fleming (Vicky McClure) and Supt Ted Hastings (Adrian Dunbar) team up to interrogate bent copper DC Taylor, played by Jason Isaacs, who they believe knows the identity of the real 'H'.
Unfortunately for DC Taylor, he has found himself a decidedly inept lawyer who is played by comedian Lee Mack.
The forthcoming sixth, series of Line of Duty recently began filming and is due to air later this year.
Killing Eve will also take part in the Sport Relief fun, become "Killing Steves" for one night only.
The sketch sees a mysterious blonde assassin go on a killing rampage, gunning for victims all of whom bear the name Steve.
Her targets include snooker genius Steve Davis, Coronation Street's Steve McDonald, Olympic rower Steve Redgrave and Saturday Night Takeaway's Stephen Mulhern.
This year's Sport Relief will also feature comedian Romesh Ranganathan playing against Andy Murray in a rather unorthodox version of golf's Open Championship at a mini-golf course.