aliens had withdrawn all their key personnel from Earth prior to its use, and the closing narration is that Vincent, Edgar Scoville, and the now convinced Special Assistant will join forces as the vanguard to watch for any return of the Invaders. Thus, this episode can be seen as showing Vincent achieve his goal of 'convincing disbelieving authorities' at least, and the Invaders' plans temporarily thwarted, leaving the door open for any possible later sequel or spinoff series. Characteristics of the invaders The emphasis of the series 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 "Genesis" (season one, episode five), an ill alien researcher loses his human form and is briefly seen immersed in a tank of water. "The Enemy" has a dying, mutated Invader (Richard Anderson) revert to his true appearance. Unless they receive periodic treatments in what Vincent calls "regeneration chambers", which consume a great deal of electrical power, they revert to their alien form. One scene in the series showed an alien beginning to revert, filmed in soft focus and with pulsating red light. Most of the aliens, in particular the lowest-ranking members or workers in green jumpsuits, are emotionless and have deformed little fingers that can not move and are bent at an unnatural angle, although "deluxe models" could manipulate this finger. Black aliens' palms were not pale, like humans of African descent, but were the same shade as the rest of their skins. Some mutants experience emotions similar to those of humans and even oppose the alien takeover. When aliens die, their bodies glow red and burn up along with their clothes and anything else they were touching, preventing the documenting of their existence. On several occasions, a dying alien would deliberately touch a piece of their technology to prevent it from falling into the hands of humans. In episode three ("The Mutation"), a female alien who falls for Vincent and is