Feb. 18, 1962 - Tonight on “Bonanza,” Adam Cartwright (Pernell Roberts, pictured) stops to aid injured rancher Matt Grant (John Archer). Adam then takes him home and stays to help Matt’s wife and son while he recovers. What Adam doesn't know is that Matt is part of a gang of rustlers. And now that Adam can identify him, the gang wants him dead. 9 p.m. on #NBC.