Post-production on the episode was delayed by Roddenberry 's involvement in another pilot , '' Police Story '' . Post-production finished in January 1966 and the episode was presented to NBC for approval ( which finally came in February 1966 ) . This original version ( production number 02a ) differed from the later final broadcast cut ( production number 02b , airing on September 22 , 1966 ) in that each of the four acts had on-screen titles ( " Act I " , " Act II " , etc. ) , as well as an epilogue . It also featured a much longer opening narration by Shatner . In some places alternate musical scores were used . In total almost five minutes of footage was removed to accommodate the original series 50-minute network broadcast format to allow for commercials . The episode in its original version was seen by the public before the aired version , having been shown at the 24th World Science Fiction Convention in Cleveland , Ohio , on September 3 , 1966 — shortly before the premiere broadcast of '' Star Trek '' on NBC
24th World Science Fiction Convention
24th World Science Fiction Convention
Where No Man Has Gone Before