Plasmic psychovore
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The plasmic psychovore was a "psychic puddle" that fed on the pain that its victims would suffer in their future. It arrived in Cardiff through the Rift with God, for whom Torchwood mistook it.
Jack Harkness tracked it down to the sewers where it had been feasting on Weevils and it left after Jack and Orr caught up with it. It followed them to St John Colchester's funeral and fed on Tyler Steele's future pain before he and Colin Colchester-Price began talking about their grief together. The psychovore was destroyed when Orr transformed into it and it fed upon its own future pain. (AUDIO: Future Pain)