Kit Harington stars in new trailer for Spooks movie The Greater Good

British actor is best known for his role on epic HBO TV series Game of Thrones

Peter Firth and Kit Harington in Spooks: The Greater Good

Kit Harington has appeared in the latest trailer for Spooks: The Greater Good.

The actor, best known for his role as Jon Snow on Game of Thrones, swaps battling wildlings for more covert operations as he plays former MI5 agent Will Holloway.

Lasting a minute and a half, the trailer opens with the escape of high ranking prisoner Adam Qasim (Elyes Gabel) as MI5 suffers “the most serious failure in the organisation’s history.”

The fallout sees secret service legend head of counter-terrorism Harry Pierce (played by Peter Firth) resign in disgrace before disappearing off the Thames Bridge in the middle of the night.

Harington's character, formerly Pierce's protégé before he was "decommissioned" by his mentor, appears to have been rejected from the organisation before being brought back in to track down his old boss.

In the trailer Pierce makes contact with Holloway, offering him a dangerous choice: turn him in – or trust the man who fired him from the Secret Service.

Written by Jonathan Brackley and Sam Vincent, with Bharat Nalluri behind the camera, the film will open on 8 May this year.

The series of Spooks ran for nine years, from 2002 to 2011. The BBC show was also broadcast abroad, including the US and Canada, under the name MI-5.