" Alone " is the final "Monster-of-the-Week" episode to feature Fox Mulder (David Duchovny) before the original series' initial conclusion. Where to Watch
With Dana Scully on maternity leave, John Doggett is assigned a temporary new partner, Leyla Harrison—a young FBI accountant who is an obsessive fan of Mulder and Scully's previous work. They investigate a series of deaths in upstate New York linked to a biologist, Herman Stites, who has mutated into a venom-spitting reptilian creature.
The episode highlights the transition from the Mulder/Scully era to Agent Doggett's leadership. Scully gifts Doggett her Apollo 11 medallion, symbolizing their teamwork and his new responsibility over the X-Files.
You can watch " Alone " on several major platforms (availability may vary by region): Stream the full episode on Hulu or Disney+ .
Through Agent Harrison, the writers playfully address long-standing fan questions and plot holes. For instance, she asks Mulder and Scully how they actually managed to escape Antarctica at the end of the first film, a question they avoid answering.