Coadapted by David Harmon from his own TV play, the psychological western Johnny Concho stars Frank Sinatra as the title character, a callow young punk who lives off the reputation of his gunslinger brother. Most of the townsfolk consider Johnny to be nothing more than a cowardly bully; only Mary Dark (Phyllis Kirk), who loves Johnny, and gunfighter-turned-preacher Barney Clark (Keenan Wynn) can see the scared little boy beneath his swaggering facade. When word comes down that Johnny's brother has been killed and that the killers (William Conrad and Christopher Dark) intend to take over the town, Johnny runs like a scared rabbit. Eventually summoning up his innate courage, Johnny returns, hoping to convince the citizens to help him rid the town of the despotic killers. As "zero hour" approaches, however, Johnny is forced to go up against his enemies all by himself. The political symbolism in Johnny Concho is impossible to ignore, though it is up to the viewer to decide if this is an anti-Red or anti-McCarthy tract.
~ Hal Erickson, All Movie Guide