Up-and-coming advertising whiz Jim Ferguson (Alex Hyde-White) is inexplicably transported back in time to the dangerous front lines of World War I. Struggling to understand what's happening to him, he learns he's the "time twin" of a flying ace, Capt. Bigglesworth (Neil Dickson). As Jim continues to bounce back and forth between the present and the past, he helps Biggles take down a powerful new weapon deployed by the Germans.