Space Rogue Devlin stole secret plans in a base and is captured by Steve Zodiac. The latter takes XL-5 to bring him to Space Pen, however, they meet the Space Spys Boris and Griselda, who set a trap in a camouflage ship and abduct Professor Mattic. As they got Devlin, who promised to share the plans with them, they go to a volcanic planet which is about to erupt to take the plans and abandon the Professor to a fiery destiny. Can Steve arrive in time to save the professor and arrest the Space Rogues ?
—RealLiveClaude