Wagon Train (1957)

S5E8 The Mark Miner Story

Mark Miner and his younger brother Matthew sneak onto the wagon train, pretending their own wagon has stalled. The travelers appreciate Mark's guitar playing and singing, but soon valuable items and cash start going missing. Unbeknownst to everyone, the brothers are plotting to frame Duke Shannon for the theft, harboring a grudge against him for their father's imprisonment and seeking payback.