Eventually , he reunites with the Tenth Doctor ( David Tennant ) for several appearances in Doctor Who .
He spends over a century waiting to reunite with the Doctor , over which time he becomes Torchwood 's leader .
He reunites with the Tenth Doctor ( David Tennant ) for several appearances in Doctor Who .
He spends over a century waiting to reunite with the Doctor , over which time he becomes Torchwood 's leader .