A vaudeville performer is pulled from the gutter by a good friend and is back in the limelight doing his show —but his new-found popularity is marred when a series of attempts are made on his life. Pete and Mac look to the man's past to find out what's prompted the threats. David Wayne guests.

Janet Blair plays a wife who hires Pete and Mac to find her missing husband just before she is murdered.

Pete and Mac journey to Mexico to save an experiment in underwater habitation for its attractive young leader after she inherits the job from her father.