[3][4] Sometime in the distant future, the planet Metropolis (once known as Earth) is a peaceful utopia led by a leader called The Great Brother.

His world is threatened by his brother Graal who has escaped from a prison satellite, stolen a warship and enlisted the help of a mad scientist named Dr. Kraspin.

Kraspin has a plan to make an army of unstoppable supersoldiers he calls "Humanoids," but to mutate them he requires the powerful element Kapitron that is being kept at the Grovan Institute on Metropolis.

Kraspin is also hiding there, given asylum in exchange for keeping Agatha young and beautiful with daily injections of a youth serum he creates by sapping the life essence of female slaves.

Once in possession of the Kapitron, Kraspin selects the perfect specimen to test his mutation on and targets a bearded, giant of a man named Golob.

Witnessing the horror is Golob's robot dog companion Kip, who sadly watches Kraspin capture and take his master away.

Kraspin fits Golob with a brain control chip and unleashes him upon Metropolis with orders to kill the Great Brother.

At the Metrolpolis command center, Nick devises a plan to rescue Barbara with a commando raid, but the Great Brother fears innocent people living on Noxon will be killed.

Once inside the heroes discover Kraspin has a giant missile filled with Kapitron that he will explode over Metropolis and turn its population into mutant humanoids.

Golob then removes the Kapitron container from the missile which then launches across the bay and hits Graal's ship destroying it.