"When Fall the Mighty!" featuring the Invincible Iron Man by Lee and Colan/Michaels; 12 pages.
The Sub-Mariner savagely attacks Iron Man, whose reserves are low after his confrontation with Warlord Krang. Iron Man tricks Namor, and manages to get himself into a fully charged suit. When Iron Man emerges, Namor is gone, off to replenish himself in the ocean. Namor had attacked Iron Man because he inadvertently ruined Namor's opportunity to catch Warlord Krang.
Story continues in Tales to Astonish (1959) #82.
Reprinted in Iron Man Special #1.
"He Who Holds the Cosmic Cube" featuring Captain America, Living Legend of WWII.
Captain America witnesses the crash landing of a pilot into the Hudson. He rescues the pilot, who turns out to be an A.I.M. scientist, incoherently warning about betrayal by the Keeper of the Cube, and the menace of the Red Skull. The Red Skull has double-crossed A.I.M., stealing their prized weapon. Cap tracks him down to his island lair and struggles with the Skull, but can't prevent him from getting his hands on the device that empowers one's every thought.