Fantastic Four #4 (May 1962)

The new Marvel reaches back to the 1940s. Kirby shows Namor wading into the surf with Sue Storm in his arms while the rest of the team gives chase, and the caption at the bottom says it plainly: "The Coming of the Sub-Mariner!" Reviving a Golden Age character inside the new continuity set the pattern that Captain America would follow two years later in Avengers #4.