I guessed wrong too, which was a surprise to me when I looked this up:
“New filming took place for the framing story for “The Cage”. Since actor Jeffrey Hunter was unavailable to reprise his role as Captain Pike, a look-alike actor, Sean Kenney, played the injured captain in the new scenes, although Hunter was represented in flashback footage and credited accordingly (along with the other original “Cage” cast).” source
TOS had 2 actors? I remember there was a later episode but I assumed it was the same actor? Guess I assumed wrong
I guessed wrong too, which was a surprise to me when I looked this up:
“New filming took place for the framing story for “The Cage”. Since actor Jeffrey Hunter was unavailable to reprise his role as Captain Pike, a look-alike actor, Sean Kenney, played the injured captain in the new scenes, although Hunter was represented in flashback footage and credited accordingly (along with the other original “Cage” cast).” source