Plunging us into the treacherous world of MI5's counter-terrorism unit as they battled to protect London, Spooks was one of the BBC's longest-running and best-loved spy dramas.
It was known for its graphic violence – we'll never look at deep fat friers in the same way again – and penchant for killing off beloved characters with very little warning.
Three years after we witnessed poor Ruth bleeding to death in Harry's arms, it's coming back as a feature film. Here's what we know so far about Spooks: The Greater Good...
It'll be in UK cinemas next spring
Hit MI5 drama Spooks was on BBC1 for nine years before closing its final casebook in 2011. Fans of Harry Pearce and his counter-terrorism unit will be pleased to hear that the team will be back in our lives in just six months' time, when Spooks: The Greater Good hits UK cinemas on May 8th 2015.
Peter Firth is reprising his role
Well, it wouldn't be Spooks without him, would it? Firth played MI5 head Harry Pearce in every single episode of the drama. We won't be finding Harry in an especially happy place, though. He is "disgraced and forced to resign" after a terrorist escapes from MI5 custody and "disappears one night off a bridge into the Thames..."
And he's going rogue...
It'd take more than a late-night river plunge to kill off Harry. Working independently from MI5, The Greater Good will see Harry attempt to hunt down the missing terrorist and prevent an impending attack on his own.
Game of Thrones star Kit Harington is joining the team
Kit Harington is swapping the snow-capped peaks of Westeros for the streets and back alleys of London. 27-year-old Harington will play Will Holloway, a former agent who is brought back to London from Moscow in the aftermath of the terrorist's escape. Will must decide whether to help Harry or turn his rogue ex-boss in...
He's playing a troubled soul...
"Spooks was still a similar troubled character to what I played before," Harington told Empire, "but in a contemporary, completely plot-driven thriller."
Lara Pulver will be making a return, along with a few other familiar faces
Before we knew Sherlock star Pulver for playing occasionally clothed dominatrix Irene Adler, she starred in Spooks – playing the acting head of the counter-terrorism division in MI5 while Harry was on forced leave. She starred in the show's final series and she'll be back when it hits cinema screens. Tim McInnerny – who played the chairman of the Joint Intelligence Committee in the TV series – will also be reprising his role.
Homeland's David Harewood is on board
Harewood will play Warrender alongside new Spooks stars Jennifer Ehle, Tuppence Middleton and Elyes Gabel.
It was filmed earlier this year
In London, Berlin, Moscow, Coventry, Pinewood Studios and on the Isle of Man. In fact, at one point production was taking place next to Marvel's Avengers Assemble. "Our set was posted next to the Avengers' Marvel set, which was like 20 times the size," Harington says. "One corner of it would have been ten times what the budget of our entire movie would be! It was interesting to see that."
Spooks: The Greater Good will be in UK cinemas on 8th May 2015