“Space: the final ________”: what word was used in Star Trek’s introduction?

Do you recall sitting down for an episode of Star Trek, and soon the opening credits would run, with a voice-over introduction by Captain James T. Kirk? Star Trek captured the imagination of its viewers. The genre was highly-sought after thanks to the space race that was heating up between the US and the Soviet Union.

Captain Kick, together with his trusty mates Spock (First Officer and Science Officer) and Leonard H. “Bones” McCoy (Chief Medical Officer), would go on a mission “to seek out new life and new civilizations” aboard the starship Enterprise.