Out of control, Hulk rampages through a city at night, until Rick Jones can calm him down and take him away. At dawn, Hulk turns into Bruce Banner, who builds a resistant underground compartment to hold the Hulk at night, and prevent the monster from running free. That is a temporary measure until Banner can find a cure for himself.
Meanwhile, an alien race, the Toad Men, approaches our planet, planning an invasion. Needing to know humankind’s technological and weaponry advances, they scan the population for the “brightest scientist” and find Banner. The Toad Men kidnap Banner and Jones.
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