The Alien Gas Monster is difficult to pinpoint. No planet of origin was identified. It landed in what seemed to be meteorite, but was in fact it’s travel capsule. When the capsule was penetrated by the chisel Gwen threw at Owen it escaped into the air and eventually found Carys. It occupied her body and went on a sex spree, taking the energy of the male bodies at the point of orgasm, and reducing them to dust.

Death: The creature was captured in gaseous form in the ‘mobile energy prison’ that Torchwood were testing, and unable to reach another Human host it died.