Incredible Hulk Vol 1 #164
"The Phantom From 5,000 Fathoms!"
COVER IS OFF-SET SEE SCAN
Hulk meets some Seahumans, who make him to join them in a battle against their leader, Captain Omen. But a spy is between the freedom fighters. As they attack the leader, the spy tells them that the captain is his father. Hulk does not understand, and tries to hit the captain. But a big blue monster steps in.