Captain America Annual #4

This 1977 King-Size Annual delivers double-length action from Jack Kirby, and the cover makes the stakes immediately clear: a grimacing Captain America is caught in the iron grip of Magneto's Brotherhood of Evil Mutants, his shield barely raised as a cluster of menacing figures closes in around him. Magneto himself looms enormous above the chaos, his helmeted face dominating the composition with an unsettling intensity. Penciled by Kirby and inked by Frank Giacoia, it's a bold, kinetic image that sets up "The Great Mutant Massacre!" as one of 1977's most action-packed Marvel reads.