Marvel Super-Heroes #21
In "Sub-Mariner!", the Avengers grapple with guilt over the Hulk’s destructive path after he wanders off, leading them to track him down. Just as tensions flare and battle seems inevitable, the Sub-Mariner unexpectedly steps in—aligning with the Hulk in a moment that shifts the tide. Written by Stan Lee and brought to life with dynamic art by Jack Kirby, with inks by P. Reinman and lettering by S. Rosen, this 1969 issue features a striking cover by Marie Severin and John Romita.
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After he left them, the Avengers feel responsible for the damages that the Hulk may cause. They start a search for him and find him. When they start to battle, the Sub-Mariner joins the Hulk.
Plot details indexed by the Grand Comics Database (CC BY-SA).