Re-edited feature version of serial The Phantom Empire (1935). Singer Gene Autry discovers a race of advanced humans living beneath the earth.

A story of love, humor and drama against the background of America's "Biggest Little City." An (interrupted) indiscretion by John Wyatt with a floozy prompts his wife, June, to make a trip to Reno, Nevada in order to get a quickie six-week-waiting-period divorce. John, penitent over his past actions (since he got caught), follows his wife to Reno and manages a reconciliation after a murder gives him a chance to prove his true devotion.

Naval commander Charles Sturm has made life miserable for his wife Diana due to his insane jealousy over every man she speaks to. His obsessive behavior soon drives her to the arms of a handsome lieutenant. When Charles learns of their affair, he plots revenge.