Kiefer Sutherland returns as the greatest TV action hero of them all and this time he's in London trying to defuse a potentially devastating plot that could have global ramifications.
At the end of the last season, Jack went into exile after getting into a spot of bother with some Russians. Now, there's a death threat against President James Heller who's visiting Alastair Davies, the prime minister, in London, as well as the twisted conspiracies of Margot Al-Harazi, the vengeful wife of a notorious terrorist, to deal with.
The CIA, as always, have their wires crossed and order Jack in for questioning. But they don't know how he operates, can familiar faces who do know Bauer help him save the world?
24: Live Another Day, Sky 1, 9pm
Got an iPad or iPhone? Reveal Mag is specially designed to fit!