TV Guide reported from the set of Lost in Space (Sep 24, 1966), including how Jonathan Harris stole the show right out from under Guy Williams, and not everybody was happy about it.
Three in particular: Williams, Lockhart and Goddard, but they sucked it up and collected checks for three seasons, no matter their billing and original character in relation to Harris. Its too bad Takei, Doohan and the other "B" and "C" cast members failed to understand that
Shatner's agent had probably warned him long before that issue went to print that you don't want to be the next Guy Williams. TV leading men were on notice: you have to defend your part.
Further, no one in the 60s or beyond made the case that there was more for Doohan, Takei or Koenig to do on the show to any substantial, regular degree, so the idea that their dreams and career ambitions were snuffed out by Villain Moustache a-twirlin' Bill is nonsense. This is not like the
Gilligan's Island situation where Tina Louise (Ginger) claimed she signed on the show because Sherwood Schwartz and his partners assured her she was the star of the show (what...the
title of the series did not tip her off?), only for the truth to unfold before her eyes as the series went into production. There was no lie, big promise or misunderstanding or parallel to the Louise situation in the
Star Trek case.
Shatner was the star of the series, asserted himself as the star (and it was his right to do so) and eventually he and Nimoy's jockeying/competitive behavior had the same effect on the rest of the cast...but that effect was minimal, because the "B" and "C" players were
never meant to share that level of character importance to the series.