The surface of the Earth is under attack, thousands of people are killed in this unprovoked attacked. The cause, Princess Dragonmon and her army of monsters have decided to invade. Princess Dragonmon is an alien whose race has been hiding under us for centuries waiting to attack at the time is right. A doctor has been preparing for something like this and turns his assistant Rayma into the cyborg hero known as Inframan. Now only Inframan stands between the Earth and Princess Dragonmon but when a close friend is captured and brainwashed, can she be stopped with this inside man feeding her info?

An Earth Defence Brigade is formed to protect the world against invaders from outer space. The ruthless Frang Gang begins its raid against the earth on land, sea and by air. But they meet their match in the super robots of the Earth Defence Brigade.

"When a nuclear catastrophe lays an entire civilization, the Green Empire, to waste, its remaining inhabitants turn to the only method of survival they can think of: they take human beings into captivity and force them to rebuild their empire. Sent to rescue the captives are Captain Leo and his Cosmos Warriors. He strikes a deal with the Queen of the Green Empire, but when she refuses to let the captives go and orders the assassination of all the Cosmos Warriors, Captain Leo must prepare for a battle with much more at stake than just the well being of the captives. The fate of humanity just might rest in his hands." Official Synopsis. Hong Kong English Dub of the 1978 South Korean cartoon "Black Knight of Space" (우주 흑기사)