Bonanza (1959)

S8E11 The Oath

During a business trip to a neighboring town, Ben encounters a towering saloon worker who, after murdering an elderly miner responsible for destroying his home, is taken by Ben to the sheriff. The man is convicted and sentenced to hang. Meanwhile, Charlie Monahan has coerced his half-breed son, Charlie Two, into vowing revenge on Ben. Little Joe learns of this threat and sets out to stop Charlie Two from fulfilling his promise. Unbeknownst to Charlie Two, Joe is actually Ben's son when they cross paths on the trail.