It was successful enough that two further sequels were released in 1939 and 1941, and Byrd become so connected with the character he went on to play him in a subsequent television series.

This serial charts Tracy's efforts to capture the gang of Pa Stark (Charles Middleton) and his five criminal sons....Champ, Trigger, Dude, The Kid and Slasher.

A young promising G-Man named Ron Merton (David Sharpe) is murdered by the Starks while trying to help Tracy bring the gang to justice.

[1] Like in the other three serials of the Republic series, Tracy is depicted as a West Coast FBI agent instead of being, as he is in the original comic strip, a local police detective for a large Midwestern city.

[1] The serial was re-released on 17 July 1948 between the first runs of Dangers of the Canadian Mounted and Adventures of Frank and Jesse James.