Omicron

Omnicron was an artifical intelligence that was created by a race called the P'Shem to explore the rift, and had mapped a model of the universe onto the quantum tesseract fold inside his body. It also had the ability to shapeshift. (TM: Rift War! Part Seven: The Man Who Fell to Earth/The Enemy of my Enemy...)

He is Omicron, an artificial intelligence created by a race called the P'Shem to explore the Rift, and he has mapped a model of the Universe onto the interior of a quantum tesseract fold inside his body. He is also the last of his kind; the P'Shem are long extinct, as something came through the Rift and ate their world. The Harrowkind are hunting him for the information stored in his body, which could enable the Sanctified to conquer countless worlds. Jack convinces Omicron to return to the Hub and help Torchwood find a way to keep him out of the wrong hands. Omicron returns Jack and Gwen to the real world, but the Harrowkind detect the energy release and descend upon the shopping centre en masse. The other Torchwood operatives, including Vox, have followed Jack and Gwen to the Arcade, and bystanders are put at risk when the Harrowkind open fire on them. Omicron steps forward and absorbs the Harrowkind into himself, as he had done for Gwen and Jack, intending to release them once he's found somewhere safe. But before he can do so, Vox shoots and destroys him, coldly telling the appalled Torchwood operatives that sacrifices must be made in war.