"Deadalive" is the fifteenth episode of the eighth season of the science fiction television series The X-Files. It was written by executive producers Chris Carter and Frank Spotnitz, and was directed by Tony Wharmby. "Deadalive" explores the series' alien mythology story arc. Following its North American premiere on April 1, 2001, it received a Nielsen household rating of 7.3 and was watched by 12.4 million viewers. "Deadalive" garnered mixed reviews from television critics; while most were happy with the return of actor David Duchovny, some criticized the episode's plot holes. It later won the show's last Emmy Award, for Outstanding Makeup.
