With this issue, the title begins twin features with Iron Man and Captain America, and the text stories have been discontinued.
"Battling the Black Knight!" (X-775) featuring Iron Man by Lee and Heck; 13 pages.
Tony Stark is having a heart attack in his office, and his biggest worry is that Pepper Potts or Happy Hogan will see his chest plate in trying to help him, revealing his secret. Luckily, the Black Knight has broken out of prison and chooses to attack Stark Industries at that precise moment. Tony manages to get into his armor and swings into action, but when the show is over, he can't remove his armor for fear of another heart attack, and so Iron Man has to cover for Tony Stark's disappearance. Pepper and Happy are suspicious.
Reprinted in Marvel Collectors' Item Classics #16.
"Captain America" (X-780) by Lee and Kirby/Stone; 10 pages.
Somebody has to be on duty at Avengers' Mansion, and tonight, it's Cap's turn. He and Jarvis settle in for a quiet evening, but some local mobsters get the idea that Cap would be easy pickings, and they mount an attack. They get more than they bargain for.
First Captain America Silver Age solo feature.
First appearance of Edwin Jarvis.