The X-Files (1993)

S1E24 The Erlenmeyer Flask

Deep Throat highlights a news report regarding a fugitive believed to have drowned, prompting Mulder and Scully to investigate, even though they initially see nothing remarkable about the case. With Deep Throat's urging, they uncover information about a clandestine government initiative called Purity Control, which involves human test subjects being infected with alien DNA. However, as they dig deeper, they find that evidence and anyone who has encountered it are swiftly being silenced.