End Game (The X-Files)

In the context of The X-Files, "End Game" is the 17th episode of the second season, originally airing in 1995. It is a "Monster-of-the-Week" episode, not directly connected to the series' overarching mythology, but deals with themes of science, morality, and the potential dangers of government secrets.

The episode revolves around the reappearance of a former test pilot who disappeared years prior, presumed dead. He returns with extraordinary abilities, including the power to breathe underwater and increased physical strength, gained through experimental genetic modification conducted by a shadowy government program called Project: Kraken.

Fox Mulder and Dana Scully investigate the case when a series of suspicious deaths are linked to the pilot. Their investigation uncovers the government's attempts to create a "super soldier" capable of surviving in extreme environments. The modified pilot, initially believing he was serving his country, is now suffering from the adverse effects of the experimentation and seeks to prevent others from undergoing the same procedures.

The episode explores the ethical implications of scientific advancements used for military purposes and the potential for abuse within covert government programs. It features elements of science fiction, action, and suspense, typical of The X-Files format. The title "End Game" likely refers to the pilot's realization that his abilities are slowly killing him and his attempt to bring down the program responsible, representing a final, desperate act to control his fate and prevent further victims.