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is on Vincent and his efforts, and unlike most science fiction the back story of the aliens--their "dying" planet in "another galaxy" (or even their names)--is "a deliberate blank". They appear human except for a few telltale characteristics (they lack a pulse, the ability to bleed, or show emotion, and many have a deformed fourth finger). While the disguised aliens can be killed by humans, they glow red and disintegrate when this happens, eliminating evidence of their existence. The aliens are shown in their true form in only two episodes. In

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