Screen Rant

Star Trek's first pilot had a completely different cast to the rest of the series. 1 / 7

And the entire franchise would be very different now if that cast had stayed on. 2 / 7

Kirk would've been replaced by the straighter Pike. Less of a maverick and less charismatic. 3 / 7

The trio of Kirk, Spock and McCoy wouldn't have emerged. 4 / 7

Spock also couldn't have been so coldly logical, since this was Number One's thing. 5 / 7

"The Cage" was a more cerebral story, and was ditched to bring in more action. 6 / 7

But the episode is considered a classic nowadays. 7 / 7