Mind Meld: Secrets Behind the Voyage of a Lifetime is a 2001 American documentary film in which actors William Shatner and Leonard Nimoy discuss the Star Trek science fiction franchise and its effects on their lives.

The film's title refers to a fictional practice in Star Trek—a mind meld is a telepathic link that Vulcans are able to create with other organisms.

Mind Meld attracted some notoriety because of an unintended sound in one scene that became a popular subject of flatulence humor among Star Trek fans and on morning zoo radio programs.

Shatner denied being the source of this sound in multiple interviews; he and Mind Meld's director, Peter Jaysen, attributed it to equipment on set.

[14] The conversation is mostly guided by Shatner, who prompts Nimoy to discuss issues he had regarding the legitimacy of consistently portraying an extraterrestrial, and other struggles with his acting career at the time.

[15] He developed "a major drinking habit, probably during the second or third year" of the series, he says, and had his secretary bring him alcohol in paper cups at the end of each day of filming.

[15] Shatner says that acting in Star Trek was "life-consuming" and left him "barely any time for family", and that this was the reason for his divorce from Gloria Rand, his first wife.

[15] He also talks about the death of his father, Joseph Shatner,[8] and of his third wife, Nerine Kidd, who accidentally drowned in a pool in 1999, losing a battle with alcoholism.

"[11] The title of the film refers to a fictional practice in Star Trek; a mind meld is a telepathic link that Spock is able to create with other organisms because he is part Vulcan.

[27] The Mind Meld DVD offers widescreen and fullscreen options, Dolby Digital surround sound, and a five-minute "making of" featurette.

[29] The film's release prompted Wil Wheaton, who had portrayed Wesley Crusher in Star Trek: The Next Generation, to change the name of his comic science fiction improvisational theatre company from "Mind Meld" to "EarnestBorg9".

[32] Two years later, Mind Meld was included in the bonus material when the first six Star Trek films were re-released as a special edition box set.

[33] Around 52 minutes and 47 seconds into the film, when Shatner is talking about the other Original Series actors disliking him,[13] he shifts in his chair and a sound evocative of flatulence is audible.

[13] On Conan O'Brien's Late Night program on November 14,[33] Shatner called it "outrageous" that Buckman should assume him to be the source of the sound rather than Nimoy.

"[34] Jim Dawson devoted an entire chapter of his 2006 Modern History of the Fart to Shatner's alleged flatulence in Mind Meld, which he compares to the sound of someone stepping on a tribble.

[13] Sarah Sloboda of The New York Times wrote that Mind Meld "provides a genuine glimpse of the lives of the stars shadowed by the roles that defined their public personas, and the mutual experience that binds them as friends".

He called the film "seemingly interminable" and said the discussion between Shatner and Nimoy shows that they "rival black holes in sheer self-absorption".

[17] Vern Perry of the Orange County Register called the film fascinating, writing that it skilfully combined humor and earnestness.

[28] Greg Stacy of OC Weekly reported being "thoroughly charmed" by the film, and called "the affection between [Shatner and Nimoy] obvious and touching.