Abaddon

Abbadon is the son of the Great Beast that was imprisoned beneath the Rift. Somehow Abbadon was able to make contact with Bilis Manger who can walk through time and teleport at will, presumably a power granted by Abbadon who employed him to do his bidding which resulted in his release after Manger was able to manipulate the entire Torchwood team in various Timelines. He is shown to be the manager of a 1941 dance hall, and in the present day remains its caretaker.

Once Abbadon is released and his shadow cast, only the undying Captain Jack Harkness that can stand in his way, who remarks “I’m an all you can eat buffet” Once in his shadow Jack is tortured by Abbadons energy’s while Gwen can only look on in horror. Jacks immortality was Abbadons ultimate down fall, unable to cope with the unlimited amount of energy he was absorbing Abbadon began to break apart and fell before jack. The son of the Great Beast was no more.