AllMovie

Saved from electrocution by the sudden appearance of a trap door operated by the traitorous Lord Argo (Wheeler Oakman), Gene Autry overhears the Muranian conspirators plan to destroy the universe by means of several hideous weapons invented by Rab (Warner P. Richmond). After subduing both Rab and Gaspar (Stanley Blystone), Gene is able to contact Frankie (Frankie Darro) at the Radio Ranch. Believing that Gaspar has betrayed her, Queen Tika (Dorothy Christy) orders the Junior Riders to be destroyed by a guided radium bomb. Gene bravely fights his way to the surface armament tower and manages to change the bomb's trajectory away from the kids. Unfortunately, the device makes a u-turn instead and explodes the armament tower.