Turlough is the last in the line of alien companions, and also the last male companion of the classic era. When we first meet him, he is a sixth form student at an expensive boarding school somewhere in the south of England, and so is presumably about eighteen years old. He is desperate to escape from Earth, but, while he admits to the other players that his character is alien, Turlough's player gives out no information at all about his background, or how he got to Earth in the first place. It's entirely possible that he's left this blank, with the intention of filling in a backstory later; it would explain why he sometimes mentions his homeworld, but never actually says what it's called.
Then again, it's possible that he's just being cagey. The "rogue" aspect of the character is only partly built on the obvious skills of lockpicking, devising traps, and so on, and is far more based in deception and similarly subtle methods. Turlough seems to be a master of Fast Talk, Bluff, or whatever else your system might call it. Right from his first story, we see him getting another student into trouble to divert attention from himself, and successfully tricking the headmaster into falling for the ruse. There are other instances in later stories where he uses the same skill again, albeit usually with less base motives.
