Torchwood

Owen is the only member of the Torchwood team never to have had direct contact with the Doctor. Jack has been companion to both the Ninth and Tenth incarnations, Toshiko met the Ninth Doctor while examining the space pig in 'Aliens of London' and Gwen and Ianto met the Tenth Doctor through the sub-wave network in 'The Stolen Earth'.

The Doctor has never made an appearance in 'Torchwood'.

Prior to becoming involved in the revival of 'Doctor Who', Russell T. Davies had conceived of this series as a concept about an alien-fighting team called 'Excalibur'. After 'Doctor Who' became a success, Davies decided to rework the idea as a spin-off.