You've never heard them, nor were they ever recorded, but Gene Roddenberry wrote lyrics for composer Alexander Courage's famous theme. And, apparently, he did it just for the money.
As the story goes, Alexander Courage took the job no one else in Hollywood wanted: to write the theme music for a "serious" science fiction TV show pilot that had no guarantee of ever seeing the light of day. But it did, and it was—at the time of Star Trek's original airing—a modest success.
Courage was, as the theme's composer, in line to receive a financial windfall, as he'd be paid royalties every time an episode of Star Trek aired. Even if Trek had never become the pop-cultural juggernaut that it did, that would still be a handsome sum.
Until creator Gene Roddenberry decided he wanted a piece of that particular pie. Citing a deal he'd made with Courage—one that granted Roddenberry the option of writing lyrics to the main theme music, which would then split the royalties down the middle—Roddenberry did just that.
And here's what those lyrics were—sing along, if you like:
The rim of the star-light
Is wand'ring in star-flight
He'll find in star-clustered reaches
Strange love a star woman teaches.
His journey ends never
His star trek
Will go on forever.
But tell him
While he wanders his starry sea
Remember, remember me
At the time, no one was guaranteed any profits out of Star Trek, and Roddenberry was just protecting his intellectual investment. But Courage would never work for Roddenberry again.