John Porter, hero of the original "Strikeback" novel and TV series, returns in a new adventure, when old enemies infiltrate SAS selection. 1999. 80 hardened squaddies are in the Brecon Beacons, trying out for the Regiment, when eight masked gunmen pour out from behind cover and launch an attack. Porter and John Bald must lead a Strike Team on a secretive and illegal mission to hunt down those responsible. This new series replaces Chris Ryan's "Extreme" series.