Locke was a man from the future, part of the future version of the organisation known as the Templar Knights. He was sent back in time, with a less advansed Korean version of Bob created for just war rather than partial reconnosence as the Bob and Becks units are, to recover the Holy Grail from the Templar knight in 1193 Sherwood Forest in The Doomsday Code. They belived that the Grail was the key to knowing what was behind a door that had appered in the future.
He set about to create peasent revolts using the Support Unit as a Robin Hood figure stealing and killing the rich. He accidentely captured Liam as he was the Sheriff of Notingham at the time apointed by King John .