It looks like Kit Harrington is trading in his chainmail and heavy fur coats for some polos and tennis rackets. The British actor, best known to audiences for his role as Jon Snow in HBO's hit fantasy series Game of Thrones, is starring in a completely different role for the Network.

Harrington, along with Brooklyn Nine-Nine's Andy Samberg, is set to star in HBO's Wimbeldon Mockumentary "Seven Days in Hell."

The movie is set to serve as a satire of traditional sports documentaries such as ESPN's 30 for 30 and even HBO's own Hard Knocks series complete with dramatic interviews, archival footage, and inspirational montages. The film will cover the events of a fictitious seven day tennis match that took place at Wimbledon 2011.

Former Saturday Night Live star, Samberg will play Aaron Williams the cocksure, foul mouthed, tennis bad boy in the mold of Andre Agassi. Harrington on the other hand, is playing Charles Poole, a dim-witted child tennis prodigy who knows nothing else but the sport.

Early reviews of the film have been promising. Here's what flavorwire has to say:

7 Days in Hell runs a lean 43 minutes, most of them very funny. Director Jake Symanski and writer Murray Miller have the sports-doc conventions down cold, from the archival footage to the vintage interviews to the talking heads, which include both real sports figures like McEnroe, Serena Williams (Aaron is her adopted brother), Chris Evert, and Jim Lampley, as well as comic actors like Lena Dunham and Samberg's SNL pals Will Forte and Fred Armisen as fictional experts and witnesses.

The film is set to debut this Saturday on HBO. But subscribers of HBO's online platform HBO GO can begin viewing 'Seven Days in Hell' right now.