Bonanza - Season 13 Episode 18 : Frenzy 1973

Ben helps shepherd a young family, the Kosovos (Nick; his wife, Anna; and his son, Sandor), who had recently immigrated from Serbia. Nick soon finds he can't handle the pressure needed to become successful in America and, one evening while Ben is visiting, his mind snaps. He goes on a rampage, trapping Ben (who becomes injured) and a terrified Anna and Sandor inside their home. Ben must do all he can to keep Nick at bay and try to reason with the mentally ill rancher.