Fantastic Four #27
"The Search for Sub-Mariner" guest-stars Dr. Strange and is written by Stan Lee with art by Jack Kirby and George Bell. The romantic rivalry between Reed Richards and Prince Namor over Sue Storm, the Invisible Girl, reaches a fever-pitch. As Mr. Fantastic, Reed leads Sue into battle as part of the Fantastic Four but he also loves her dearly and plans to propose marriage. However, deep beneath the waves in Atlantis, Namor also seeks Sue to share his throne. The powerful Sub-Mariner's passion is so great, he undertakes to kidnap the girl and make her agree to become his bride.
To that end, Namor invades the Baxter Building, besting first the Thing and then the Human Torch. When Sue won't go with him willingly to Atlantis, he drugs her and takes her away. When Mr. Fantastic returns with an engagement ring, he finds his intended gone with has no idea of where Atlantis may be. Normally, a man of logic and science, Richards finds he cannot quiet the rage and fear welling in him. As he sequesters himself away to find Namor on his own via technology, the Human Torch suggests he and Thing enlist Dr. Strange, the Master of the Mystic Arts, to locate the underwater empire first. If Reed goes to battle Namor alone, they reason, he won't survive. With Dr. Strange's aid, Torch and Thing arrive just as Mr. Fantastic launches his most savage attack on the Sub-Mariner!