The forthcoming DVD release of Star Trek: The Original Series - Season 3 includes a pilot episode previously only available on the bootleg circuit. Apparently a German film collector found a print of this alternate version of the second Star Trek pilot, titled "Where No One Has Gone Before," and brought it to Paramount. Above are some clips from that alternate version of the pilot, which has never officially been released until now. From The Live Feed:
The alternate version is in three parts with 1970s-style act breaks, an entirely different version of Captain James T. Kirk's opening monologue ("But now a new task. A probe out into where no man has gone before") and music that contrasts from the famous opening theme and an extended action sequence.
From the (press) release:
This version of "Where No Man Has Gone Before" was completed in 1965 and features archived footage that was not included in the pilot episode ultimately broadcasted. Never-before-aired, this newly recovered version is believed to be what was originally screened for NBC, and the basis for their decision to broadcast STAR TREK.
Star Trek: The Original Series - Season 3, Blu-ray (Amazon, thanks Jason Weisberger!)
UPDATE: From Memory Alpha, more background on this alternative version of the pilot episode:
There is a different, pre-broadcast cut of ("Where No One Has Gone Before") in the archives of the Smithsonian Institution. This unique cut includes a few brief scenes trimmed from the aired cut of the episode, different opening titles, and a unique closing theme. The alternate closing theme can be heard on the GNP Crescendo CD Star Trek: Original Series (Volume 1) "The Cage" / "Where No Man Has Gone Before". The pre-broadcast cut is commercially available only in bootleg form, although it has been screened at numerous conventions. Paul Carr was credited as "Navigator" in the end credits of the original cut. The version on the first season box set may contain the alternate ending theme, but does have the changed credits. This cut will be finally be available commercially on the Season 3 Blu-Ray set.