A black and white photo of Lorne Greene, Pernell Roberts, Dan Blocker, and Michael Landon riding horses in

NBC’s hit Western series, Bonanza, ran from 1959 to 1973 — but not everyone from the main cast stayed with the show the entire time. Pernell Roberts played Adam Cartwright, and he infamously didn’t get along with the writers, thus exiting the series. Later, Michael Landon made fun of Roberts for leaving the show.

Why did Pernell Roberts leave ‘Bonanza’?

A black and white photo of Lorne Greene, Pernell Roberts, Dan Blocker, and Michael Landon riding horses in 'Bonanza'
Lorne Greene as Ben Cartwright, Pernell Roberts as Adam Cartwright, Dan Blocker as Eric ‘Hoss’ Cartwright, and Michael Landon as Joseph ‘Little Joe’ Cartwright | Silver Screen Collection/Getty Images

Pernell Roberts played Adam Cartwright on Bonanza from 1959 to 1965. Adam was more serious than some of the other Cartwrights, including Little Joe Cartwright played by the young Michael Landon. And when Roberts left the role, he didn’t have much good to say.

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