Originally Posted by Zardoz
He (Spock) was a suprise to all, including Nimoy. In fact, during season 2, fearing Spock would outshine Kirk (Who was the designated lead star) they started feilding other actors to replace Nimoy as Spock, amunst them David Carridine and Mark Leonard (Who ended up playing Spock's father!)"
That's not too smart, as I see it- trying to reduce a character's popularity. They would have probably lost viewers (me!) with such a move.
Funny how secondary characters often become more popular than the star. Illya K/D McCallum comes to mind.