The actor faced uncertain financial and professional times following his two-year run on the original Star Trek TV series, which was canceled in 1969 and forced him to reevaluate his career.
“They weren’t good, at least initially,” he tells Heat Vision of the post-Trek years. “Life is full of situations where you either surrender and give up and accept things the way they are or you try to move forward and try to create a new future for yourself. I was very depressed when the show went off the air. My phone didn’t ring. My agent didn’t call. There were no offers. It really was like I was in some sort of isolation.”
Source and more: THR