Koloss #4/1968

In "Uhyret og maskinen!", Rick Jones and Betty Ross help a weakened Bruce Banner—still trapped in his Hulk form—use his own gamma ray machinery to regain control. After a risky second transformation, Banner awakens in the Hulk’s body, now with his own mind, unlocking a new ability to switch between forms at will.

In "Gladiatoren fra verdensrommet," a mysterious alien demands a battle to decide Earth's fate, challenging the planet to send its strongest warrior. When Hulk answers the call, he soon discovers the contest is a trap orchestrated by the Russians, who seek to exploit his power and create a legion of super-soldiers.