As X-Bomber is repaired, a distress call is received from an unknown planet. Dr. Benn sends Star Fleet's Dai-X crew of Shiro, Lee and Hercules to assist. They follow the call to a strange planet and find Keeli - a beautiful space princess - made prisoner as the result of a war against the might of the Imperial Alliance, the deadly machines of battle surrounding her palace dungeon. As they free Keeli, Captain Carter - now a trusted fighter for the evil Alliance - gives them his ultimatum: give up Lamia and the F-01 - or die! Carter reactivates the dormant fighting machines on the planet but Shiro and the Star Fleet crew successfully defeat them with Dai-X and bring peace once again to Keeli 's planet.
—Anonymous