Oliver Harrington

Oliver Harrington worked for UNIT and was a friend of Martha Jones. He was stationed in Switzerland working on the Particle Collider, but was tricked by the neutron eating creature into thinking it was his deceased wife, Marie. When he next saw Martha after Torchwood arrived, he took her hostage. He then escaped into the tunnels and helped Gwen remove Ianto. Finally, he confronted the creature once the tunnels were locked. The creature revealed that it was not in fact Marie, and that he only needed humans for food. In the face of his death, he told the creature that they would die together. He was the annihalated by the Collider. (BBCR: Lost Souls)