Earth is being attacked by the Mogul civilization, a super advanced people that live beneath the ocean.

Professor Yuri, having studied the ancient super-technology in Astro base, anticipated such an invasion would take place.

Led by the pilot Ishida, the Blocker Corps stands firm against the attack of the Mogul rulers, Hellqueen V and Kaibuddha.

The robots individually have their own weapon, but they can also be combined to form a fire ring which cuts through the enemies.

It was not the most popular show since anime powerhouses Gaiking and Combattler V, which featured more creative combinations and designs, were ruling the airwaves.