Iron Man is suddenly attacked by the alien brutes known as the Blood Brothers, captured, and flown to a secret underground base in the American Southwest. This is the headquarters of invader Thanos where he is holding prisoner Drax the Destroyer.
Here, Drax helpfully brings us up to date in an extended flashback: on Titan the moon of Saturn is a civilization supported by a computer called Isaac, and ruled over by Mentor and his two sons Eros and Thanos. Thanos went bad, was exiled, gathered an army and returned. Mentor appealed to the planet’s “god” Kronos who raised up Drax as a hero to fight Thanos. The battle ended with the victorious Thanos imprisoning Drax on his Earth base but the hero sent a telepathic message to Iron Man for help—and Thanos dispatched the Blood Brothers to deal with the new problem.
In the base, Shellhead overcomes the Brothers.
But he runs into Thanos who defeats him and tells of his plan to conquer Earth.
On Titan, Mentor sends an energy burst which empowers Iron Man’s armor to free Drax and the two heroes beat up the Blood Brothers.
Thanos escapes, leaving the place to self-destruct. The two heroes get away and shake hands, then part.