Inside front cover. Includes images from interior stories and staff credits for Sol Brodsky, Roy Thomas, John Verpoorten, Morrie Kuramoto, Stan Goldberg, Gary Friedrich and Flo Steinberg.
5th modern-day appearance of The Sub-Mariner. Previous appearance in FANTASTIC FOUR #14 (May 1963); next appearance in FANTASTIC FOUR ANNUAL #1 (November 1963). Although this story came out a month before FF #14, it feels much more like a sequel. 1st non-Jack Kirby Sub-Mariner story of the 1960's. Sub-Mariner exhibits the powers of a puffer fish and an electric eel, never seen again after this story!