 The original version of the pilot, produced to convince NBC to buy "Star  Trek" as a series, runs approximately 3 minutes longer and has a different  introduction, several additional lines of dialogue and reaction shots,  transitional introductions a la Quinn Martin ("Act I", "Act II", etc.), and  different opening and closing credits. This has never been shown on  television, but has circulated among "Star Trek" fans worldwide. It has been  unofficially released on public domain videos.