The FF take a much needed vacation! But while the happy family sunbathes in Florida, a mysterious fish-man is on the loose. Plus, will Reed Richards find the Lost Lagoon of mythic lore?
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(Cover Date: April, 1970)
Summary: While on vacation, the FF search for the humanoid responsible for sinking ships in the area, but have no luck. The humanoid turns into a man who works at the oceanarium. Reed recruits the man to serve as a guide for exploring the underwater caves. The humanoid smashes out of their submersible, leaving the three men to die. Ben carries Reed & Johnny into a cave with air, where they find the humanoid waiting. After Ben has a brief scuffle with the humanoid, they find the humanoid at his spaceship, with his mate inside. Reed speculates that the humanoid saw ships & them as threats & was just protecting his mate. After making their way back to the surface, they see the humanoid's spaceship blast upw more