STARRING LENOARD NIMOY AS MR. SPOCK" appearing and fading away, followed  by "GUEST STARS GARY LOCKWOOD AND SALLY KELLERMAN." Over this scene, the red  alert klaxon blares and Lieutenant Kelso repeatedly saying "Bridge to all  decks. Condition: alert!" We also see Gary Mitchell walking around the  corridors as well until finally cutting to Kirk and Spock entering the  turbolift, at which point the episode continues as normal. Additionally, the  end credits were much different in this original cut. Instead of the normal  "Star Trek" theme playing, a different piece is used and the credits only  credit the supporting characters; none of whom are referenced by name. (For  example: PAUL FIX AS: SHIPS DOCTOR, GEORGE TAKEI AS: CHIEF PHYSICIST, JAMES  DOOHAN AS: ENGINEERING CHIEF, etc.)