What's his real name?

We've seen him in four full series' worth of Torchwood as well as loads of Doctor Who episodes, but Captain Jack Harkness is still a great big riddle wrapped in a really cool coat. As Torchwood: Miracle Day comes to Watch (Monday 11th June at 10pm) here's our summary of what we know and what we WANT to know, beginning with his name.

Jack Harkness. How's that for a great action hero handle? Except it isn't actually his name. Our man nicked it from a World War Two soldier who died in combat (the two of them actually wound up having a brief and tearjerking romance shortly before the original Harkness snuffed it). So what IS Captain Jack's actual name? We just don't know, and we'll probably never find out. Damn you, Torchwood writers! (Shakes fist.)