Fantastic Four #4

1st Silver Age appearance of Sub-Mariner (Namor McKenzie)

"The Coming of... Sub-Mariner!"
Johnny looks to hide as he ends up in a half-way house where he finds the Sub-Mariner. Namor has amnesia but his memory is restored when Johnny drops him in the ocean. Namor swims home only to find it has been destroyed. Namor swears revenge on humanity and unleashes a monster to destroy NYC. The Fantastic Four join together to fight the monster as the Thing straps a bomb to his back and enters the monster's mouth to deliver it. The monster is defeated and the Torch whirls both the monster and Namor away and deposits them back in the ocean, for now.