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"Tumour alien" is a title based upon conjecture.

Check the behind the scenes section, the revision history and discussion page for additional comments on this article's title.

A tumour alien was a grey, blob-like parasite that attached itself to its victim's brain, causing symptoms that could be mistaken for Alzheimer's disease, eventually killing them. If it was disturbed, then it released a toxic gas. One passed through the Cardiff Rift and attached itself to Katie Russell. When she was operated on to remove it, it killed all of the surgeons, along with Katie. (TV: Fragments)