Cover reprinted from Fantastic Four (1961) #20 (altered).
"The Mysterious Molecule Man" (X-419) featuring the Fantastic Four by Lee and Kirby; 22 pages.
A freak accident gives a disgruntled atomic lab technician the power to control the very molecules of matter. He attempts to use his power to rule the world, but the FF discover his weakness and stop him. The Watcher removes him for safekeeping.
Reprinted from Fantastic Four (1961) #20.
"The Uncanny Unicorn!" (X-716) featuring Iron Man by Lee and Heck; 18 pages.
Tony Stark is fed up being trapped in his chest plate, and decides to be a playboy for a while. While he is gone, a new villain from the Iron Curtain comes to capture the Iron Man suit, the Unicorn, whose own armor was designed by the Crimson Dynamo. In Tony's absence, Happy Hogan is seriously injured fighting the Unicorn, and that snaps Stark to his senses.
First appearance of the Unicorn.
Reprinted from Tales of Suspense (1959) #56.
"The Challenge of Loki" (X-715) featuring Doctor Strange by Lee and Ditko/Bell.
Loki schemes to use Dr. Strange in his attempts to best his brother Thor. Strange mystically steals Thor's hammer Mjolnir, but discovers Loki's deceit in time.
Reprinted from Strange Tales (1951) #123
"The Hulk Strikes" (V-709) by Lee and Kirby; 5 pages.
With the military at his heels, the Hulk instinctively makes his way to his lab to recover the secret of the bomb. Inside, he finds the traitor Igor ransacking the place. The Hulk smashes Igor and returns to normal as the military arrives.
Reprinted from Incredible Hulk (1962) #1 (pages 7 - 11)