
Here's a question: From the day in May 1966 that Bill Shatner reported for work on Star Trek's first production episode "The Corbomite Maneuver", until the very final day of shooting on the series on January 9th 1969, what other dramatic film or television appearances did Bill Shatner make?
Not many it turns out; the rigors of working on Star Trek evidently didn't leave too much room for other projects (Bill Shatner did however make numerous appearances on quiz, interview shows and other public events during this period). Indeed, thus far we've only found two dramatic projects: the 1968 movie White Comanche (or Comanche Blanco)...

...and the TV movie Perilous Voyage, also filmed in 1968 (but not actually broadcast until 1976). Comanche was filmed during the hiatus between Star Trek's first and second seasons, while Perilous Voyage was filmed between Star Trek's second and third seasons.

By the time that Bill Shatner was cast in Star Trek, the "Jim Kirk lace" had become the standard hair for almost all of the actor's appearances on film and television. Just one example, here's Bill Shatner in 1961's The Explosive Generation:


So why when Star Trek began did Bill Shatner suddenly decide to use different toupees for his other projects? Both in White Comanche and Perilous Voyage, the actor wears hairpieces lacking the famous "you can comb it back!" feature of the standard "Jim Kirk lace" - a significant shift.
There are a number of possible reasons: Perhaps Bill Shatner felt that in the character of James T. Kirk, both he and his toupee had finally found an understanding partner; thus, it was a question of fidelity - an exclusive toupee for just this role - a very noble sentiment indeed. A somewhat weaker version of this notion would have had Bill Shatner believing that audiences now strongly identified the "Jim Kirk lace" with the character that he portrayed in Star Trek - thus, the new toupees would have been a way to prevent typecasting.

Or perhaps Bill Shatner, knowing that he had, shall we say "lifted" (also see here) a few of the toupees provided to him by Star Trek, didn't want to irritate the producers by wearing them (or the same style) on other projects.
Or was it something to do with Bill Shatner's by-this-point deteriorating marriage to wife Gloria Rand? Were the new toupees a signal that the relationship was over?
Or was it legal? Did Star Trek's producers, knowing that the toupee was developing its own ever-growing fan-base, contractually stipulate that during the show's run, the "Jim Kirk lace" must not appear in any other projects?
An interesting mystery...

Note: Perilous Voyage is a movie that our toupologists have, despite our best efforts, been entirely unable to locate - it neither exists on DVD, VHS, YouTube nor any of the other Internet resources within which one can often find rare Bill Shatner appearances. So, we've decided to offer a highly prestigious honorary degree from the WSSTS to any of our valued readers that can help us track down a copy!
Update: YouTube user "Rubypearl" has posted a brief clip from this movie - watch below:
There are a number of possible reasons: Perhaps Bill Shatner felt that in the character of James T. Kirk, both he and his toupee had finally found an understanding partner; thus, it was a question of fidelity - an exclusive toupee for just this role - a very noble sentiment indeed. A somewhat weaker version of this notion would have had Bill Shatner believing that audiences now strongly identified the "Jim Kirk lace" with the character that he portrayed in Star Trek - thus, the new toupees would have been a way to prevent typecasting.

Or perhaps Bill Shatner, knowing that he had, shall we say "lifted" (also see here) a few of the toupees provided to him by Star Trek, didn't want to irritate the producers by wearing them (or the same style) on other projects.
Or was it something to do with Bill Shatner's by-this-point deteriorating marriage to wife Gloria Rand? Were the new toupees a signal that the relationship was over?
Or was it legal? Did Star Trek's producers, knowing that the toupee was developing its own ever-growing fan-base, contractually stipulate that during the show's run, the "Jim Kirk lace" must not appear in any other projects?
An interesting mystery...

Note: Perilous Voyage is a movie that our toupologists have, despite our best efforts, been entirely unable to locate - it neither exists on DVD, VHS, YouTube nor any of the other Internet resources within which one can often find rare Bill Shatner appearances. So, we've decided to offer a highly prestigious honorary degree from the WSSTS to any of our valued readers that can help us track down a copy!
Update: YouTube user "Rubypearl" has posted a brief clip from this movie - watch below: