Pernell Roberts finished the 6th season, so last episode of that season.
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Actor Pernell Roberts was unhappy with the way the characters were developed from one season to the next, and felt it was not consistant with what he was told when he signed up for the show. So after season 6, Roberts' character Adam was sent to Australia with the opening that if he wanted to return he could. He never did.
Pernell Robert's last episode was in the sixth season, episode 197 "To Own The World," aired April 15, 1965. Adam didn't say good-bye. Roberts was fired, so he simply disappeared from the cast. He actually made two episodes after this one, but they were telecast before this one. Explanations were made in the scripts after he was gone.
Apparently, Mr. Roberts was not satisfied with the quality of the scripts and the direction the show was taking. He also bristled at calling Lorne Greene "Pa" as, in reality, there was only 13 years difference in their ages... not to mention the fact that "Adam" was apparently university educated and Mr. Roberts felt the intellectual Adam would not call Ben Cartwright by such an unsophisticated sobriquet.
The writers were a little vague whe scripting Adam Cartwright out of the Ponderosa. The general idea was he was going back east. Originally, they had hoped to have Adam return periodically but things didn't work out as planned. In later years actor Pernel Roberts regretting his decision to leave the series, but once gone, there was no turning back.
The actor that played Hoss Cartwright, Dan Blocker, didn't leave. He died in 1972, just prior to the begining of the 14th season.