Above is the title lobby card from WILD WEST DAYS (1937), 13 chapters, directed by Ford Beebe and Cliff Smith. This was Brown's second serial for Universal. Take a look at the spelling of his name - this was when he was John Mack Brown, not Johnny.
Above is a Chapter 7 lobby card for Johnny Mack Brown's WILD WEST DAYS (Universal, 1937).
Above is a chapter 5 lobby card from the serial, FIGHTING WITH KIT CARSON (Mascot, 1932).
Johnny Mack Brown (1904-1974) was a star halfback on the University of Alabama football team in the late 1920s. He came to Hollywood and began doing bit parts around 1927, but his big break was portraying the titled gunslinger in MGM's BILLY THE KID (1930), which had Wallace Beery playing the role of Sheriff Pat Garrett. His first starring cliffhanger was for Mascot --- FIGHTING WITH KIT CARSON (Mascot, 1933), 12 chapters, directed by Armand Schaefer and Colbert Clark.
Shown in the FIGHTING WITH KIT CARSON lobby card above are the real life father and son team of Noah Beery Sr. (as the baddie) and Noah Beery Jr. (as Johnny Mack's Indian helper). JMB is shown in the left border wearing the buckskins.
Noah Beery Senior (1884-1946) was the brother of Wallace Beery and his full name was Noah Nicholas Beery. You can spot him as the evil "Marsden" in ZORRO RIDES AGAIN (Republic, 1937). Noah Beery Jr. (1913-1994) was nicknamed "Pidge", his full name was Noah Lindsey Beery, and his first wife was Maxine Jones, the daughter of Buck Jones. Pidge made scores of A and B grade movies, serials, and westerns, and one of his most remembered roles was as a member of the cow-herding trailhands yellin' "whoopee!" in the John Wayne / Montgomery Clift RED RIVER (1948). In later years, Pidge played the father to Jim Garner in TV's THE ROCKFORD FILES.