Alex Krycek is a fictional character in which US TV series?

Alex Krycek is a fictional character in the Fox Network science fiction-supernatural TV series "The X-Files". During the series, Krycek is played by Nicholas Lea. He is introduced in Season 2. He becomes a partner for FBI Special Agent Fox Mulder in the absence of his prior partner, Dana Scully. As the show progresses, Krycek becomes one of the show's primary antagonists. He appears subsequently in every season until Season 9. Krycek's personal and professional actions frequently pit him against Mulder. They share a complicated relationship. Krycek is variously seen as either a henchman or enemy of the show's primary antagonist, The Smoking Man, changing his allegiance as needed.

"The X-Files" was created by Chris Carter. It revolves around FBI agents Mulder (David Duchovny) and Scully (Gillian Anderson). They investigate unsolved cases that defy explanation, uncovering deadly conspiracies, alien encounters and other paranormal mysteries. They are always looking for the truth and must find a key or keys to unlocking the truth.

The original TV series aired from September 1993, to May 2002 and included 202 episodes. A short 10th season consisting of 6 episodes premiered in January 2016, and concluded in February 2016. Following the ratings success of this revival, "The X-Files" returned in 2018 for an 11th season with 10 episodes. All 218 episodes – spanning a quarter century – involve mind-bending intrigue which stretches the boundaries of trust, faith, and belief.