Wagon Train - Season 5 - Eps 18: The Dr. Denker Story
Bill spots a young boy alone on the trail. He passes out but they later learn he can't talk but that he saw his dad killed by strangers for no apparent reason. Later, they run into Dr. Denker taking musical instruments to California.
About Wagon Train

Title: Wagon Train
First Air Date: 1957-09-18
Last Air Date: 1965-05-02
Status: Ended
Rating: 6.3/10 (from 26 votes)
Language: EN
Seasons: 8
Total Episodes: 284
Network: NBC ABC
Genres: Western, Drama, Family
Production Companies: Universal Television, Revue Studios
Synopsis
The series initially starred veteran movie supporting actor Ward Bond as the wagon master, later replaced upon his death by John McIntire, and Robert Horton as the scout, subsequently replaced by lookalike Robert Fuller a year after Horton had decided to leave the series. The series was inspired by the 1950 film Wagon Master directed by John Ford and starring Ben Johnson, Harry Carey Jr. and Ward Bond, and harkens back to the early widescreen wagon train epic The Big Trail starring John Wayne and featuring Bond in his first major screen appearance playing a supporting role. Horton's buckskin outfit as the scout in the first season of the television series resembles Wayne's, who also played the wagon train's scout in the earlier film.
Cast

John McIntire
Christopher Hale

Robert Fuller
Cooper Smith

Michael Burns
Barnaby West

Frank McGrath
Charlie Wooster

Terry Wilson
Bill Hawks