Commando Cody, the venerable Sky Marshal of the Universe (Judd Holdren, Captain Video, Master of the Stratosphere), along with trusted aids Joan Gilbert (Aline Towne, Radar Men from the Moon) and Ted Richards (William Schallert, TV's The Patty Duke Show) and later joined by Dick Preston (Richard Crane, The Eternal Sea), must foil the various schemes of The Ruler (Gregory Gay, Flying Disc Man from Mars), an evil alien life form hell-bent on taking over Earth.