Riverboat Season 2 Episode 4 River Champion ( Air Date 1960-10-10 ) Genre Western category. Overview "Gentleman Dan Muldoon is backing Dublin Boy against Gunner Stagle for the bare-knuckle championship of the river. Before the fight, Dublin Boy proves to have a glass jaw, when flattened by Grey, thus forcing the captain to take his place in the ring. Grey triumphs and becomes ""river champion.""".