Mary Marvel #7

Mary Marvel descends into a vivid undersea world on this November 1946 Fawcett cover by Jack Binder, her red-and-gold costume bright against a sunlit ocean backdrop as she reaches out to a curious seahorse while a large exotic fish and a dark-haired mermaid look on nearby. The cover promises "The Kingdom Undersea," and the warm, wonderstruck mood — bubbles drifting upward, coral formations framing the scene, small fish darting through the water — sets a genuinely enchanting tone. Otto Binder and Jack Binder's interior collaboration makes this a fine example of the "World's Mightiest Girl" in one of her more imaginative solo adventures.