African immigrant who is seeking citizenship, attacks a young black man while he is waiting for a bus, kidnapping him. Investigating the disappearance, Mulder predicts that another seed will be found. They have Marcus Duff (Carl Lumbly), a social worker who is helping Aboah apply for citizenship, cross-reference the names from the flight with those applying for permanent residency or a work visa. This leads them to Aboah, who runs when they try to question him and is discovered after squeezing himself into a drainage pipe. Aboah appears to have no symptoms of disease when he is analyzed at a local medical center, but Scully plans to examine him more. Mulder sees Diabra, a diplomat from Burkina Faso. Diabra tells him an old folk tale of the Bambara people about the Teliko, which were nocturnal "spirits of the air". Meanwhile, Scully examines a PET scan of Aboah, which shows that he has no pituitary gland. Aboah escapes the hospital and meets Duff in a car; he paralyses Duff in the same manner as his other victims and inserts a long metal object up his nose. A policeman finds Duff and requests an ambulance, and the police tell Mulder and Scully that they are sweeping the area for Aboah. Driving around, Mulder tells Scully that he thinks Aboah is the mythical Teliko. He stops at a demolition site, remembering that Pendrell found asbestos fibers on Sanders' body. Mulder and Scully split up at the site; Mulder is paralyzed and taken into a duct by Aboah. Scully, having heard Mulder's shouts for help, tracks him in the duct and is able to get him out, finding the depigmented bodies of the other victims. Aboah gets the drop on Scully, but Mulder's look alerts her and she quickly turns around and shoots him. In her field journal, Scully writes that Aboah is struggling to survive while awaiting trial. She muses that Aboah's condition and survival may be discovered by science, but humans have a fear of an alien among them which causes them to "deceive, inveigle, and obfuscate". Production Writer and executive producer Howard Gordon was originally working on an episode about someone who appeared to be immortal, but after discussions with consulting producer Ken Horton he added in the notion of xenophobia and "melanin-sucking albino vampires". Series creator Chris Carter approved the storyline, but the first draft of the script was met