"all things" is the seventeenth episode of the seventh season of the American science fiction television series The X-Files. Written and directed by lead actress Gillian Anderson, it first aired on April 9, 2000, on the Fox network. The episode is unconnected to the wider mythology of The X-Files and functions as a "Monster-of-the-Week" story. Watched by 12.18 million people, the initial broadcast had a Nielsen household rating of 7.1. The episode received mixed reviews from critics; many called the dialogue pretentious and criticized the characterization of Scully. However, viewer response was generally positive.

The series centers on Federal Bureau of Investigation (FBI) special agents Fox Mulder (David Duchovny) and Dana Scully (Anderson) who work on cases linked to the paranormal, called "X-Files". Mulder is a believer in the paranormal. The skeptical Scully was initially assigned to debunk his work, but the two have developed a deep friendship. In this episode, a series of coincidences lead Scully to meet Dr. Daniel Waterston (Nicolas Surovy), a married man with whom she had an affair while at medical school. After Waterston slips into a coma, Scully puts aside her skepticism and seeks out alternative medicine to save Waterston.

"all things" is the only episode of the series written and directed by Anderson, as well as the first episode of The X-Files to be directed by a woman. The episode makes heavy use of "The Sky Is Broken", a song from Moby's 1999 album Play, as well as a gong. The episode has been analyzed for its themes of pragmatism and feminist philosophy.

FBI special agent Dana Scully (Gillian Anderson) is getting dressed in front of a mirror. As she leaves, her colleague Fox Mulder (David Duchovny) lies in his bed, half of his body covered by bedsheets. The narrative flashes back to a few days earlier: Scully arrives at a hospital and, after a series of coincidences, meets her former professor, Daniel Waterston (Nicolas Surovy), with whom she had an affair while attending medical school. He is ill and suffering from an undiagnosed heart condition. She questions whether she made the right decision to leave him and abandon her medical career to pursue a career in the FBI. She meets Waterston's daughter, Maggie (Stacy Haiduk), who is extremely resentful of Scully for the effect she had on Waterston's family.

Mulder—on his way to England investigating heart chakra-shaped crop circles—calls Scully and asks her to meet a contact of his, Colleen Azar (Colleen Flynn), to obtain some information. As Scully speaks to Mulder on her cellphone while driving her car, a woman appears on a crosswalk. Scully brakes hard to avoid hitting the woman. As she does so, she narrowly avoids colliding with a semi-truck. She realizes that, had the woman not stepped in her path, the truck would have killed her. When she later arrives at the house of Azar, she observes that Scully is going through a personal crisis and tries to offer her guidance, but Scully is dismissive.

Later, Scully returns to apologize to Azar and agrees to listen to her ideas. Azar shares her knowledge of Buddhism, the concept of the collective unconscious, and the idea of personal auras. Azar believes these concepts might explain these strange occurrences. While visiting Waterston, he nearly dies but Scully saves him using a defibrillator; however, this also puts him in a coma. After a confrontation with Maggie at the hospital over what happened to her father, Scully walks through Chinatown. Seeing the woman who appeared earlier at the crosswalk, she follows her to a small Buddhist temple before the mysterious woman seemingly vanishes. Inside the temple, Scully has a vision of what is ailing Waterston. She returns to the hospital with Azar to visit Waterston.

Azar and a healer provide alternative treatment for Waterston, who fully recovers. He announces that he still wants a relationship with Scully, but she realizes she is no longer the same person she was those many years ago and rejects him. As she sits outside the hospital on a bench, Scully thinks that she sees the mysterious woman again, but it turns out to be Mulder. Later, the two agents sit in Mulder's apartment talking about the events of the last few days. Mulder begins to speak more existentially about what transpired, implying that fate has brought them together but, when he turns to look at Scully, he sees that she has fallen asleep.

Sometime during the sixth season of The X-Files, Anderson approached series creator Chris Carter and asked if she could write a script for an episode that explored her own interest in "Buddhism and the power of spiritual healing"; ultimately, she wanted to write a script in which Scully pursued a "deeply personal X-File, one in which [she] is taken down a spiritual path when logic fails her". She wrote the basic outline of what became "all things" in one sitting, which Carter approved due to the "personal and quiet" nature of the story. Anderson's first draft of "all things" was 15 pages too long, and it did not feature a concluding fourth act. Carter and executive producer Frank Spotnitz thus began to work with Anderson to finish the episode, although Carter and Spotnitz later acknowledged that the majority of the script "was all Gillian".