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In page Michael Landon:

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In 1959, at the age of 22, Landon began his first starring TV role as Little Joe Cartwright on Bonanza, one of the first TV series to be broadcast in color. Also starring on the show were Lorne Greene, Pernell Roberts, and Dan Blocker. During Bonanza's sixth season (1964–1965), the show topped the Nielsen ratings and remained number one for three years.[citation needed]