As of this issue, the title shifts to an all-reprint format.
Cover by Marie Severin/John Romita Sr.
"The Avengers Meet Sub-Mariner!" (X-525) by Lee and Kirby/Reinman. 25 pages.
Reprinted from Avengers (1963) #3.
The Hulk has stormed off, and the Avengers feel that he is now their responsibility. They consult with the Fantastic Four, X-Men, even Spider-Man, but fail to find the Hulk before the scheming Sub-Mariner does. Namor convinces the Hulk to stand in an alliance against the Avengers, but the deal is short-lived.
Reproduction of the cover to Avengers #3.
"No One can Stop the Vanisher!" featuring the X-Men by Lee and Kirby/Reinman. 22 pages.
Reprinted from X-Men (1963) #2.
Professor X sends the young X-Men in training to apprehend the Vanisher, who has escalated his activities from bank robbery to assault on the Pentagon. With all of the team's power, it is the mind of Professor X which stops the villain.
First appearance of the Vanisher.
Pin-ups of Cyclops, Marvel-Girl and the Beast by Jack Kirby/Chic Stone.