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.

Dr. Samson, inventor of the Hyper Travelling system, has disappeared along with his invention during an experiment on the planet Leo, and it looks like the work of the Zoic Empire. The Earth Defence Force sends Superior Falcon 7 to rescue the scientist and save the Universe from certain catastrophe. There is no silver lining in the race, only the winner survives.

Nicholas, a ruler of the Zinba Empire, wants to expand his territory and Earth is his main target. After Nicholas destroys City Orion and Earth's defences, three youngsters must find the Phoenix King, the only hope for Earth's survival against this all-conquering foe.

When a space renegade, Tonga, threatens the Earth, a crew of shrunken people and robots must be injected into the comatose body of the only girl who can direct a successful counterattack.