The term 'Bonanza Role' refers to the characters from the 1960s western television series, Bonanza. ADAM Cartwright, played by actor Pernell Roberts, was the eldest son of Ben Cartwright and the responsible leader of the family. His character was known for his intelligence and level-headedness. Hoss Cartwright, played by actor Dan Blocker, was the middle son of Ben Cartwright and was known for his strength and loyalty. He was often portrayed as a gentle giant with a heart of gold.