Sub-Mariner (1968 1st Series) 21 CGC 9.4

"Invasion from the Ocean Floor!" Script by Roy Thomas. Pencils by Marie Severin. Inks by Johnny Craig. Cover by Marie Severin and Johnny Craig. With Prince Namor trapped in Manhattan, Lady Dorma and Warlord Seth send the Atlantis attack fleet to rescue him! But the Sub-Mariner knows that the imperial fleet's arrival in New York Harbor will start a massive war with the surface people! And to make matters worse Seth blows the Horn of Proteus to summon giant sea creatures to join the attack! Oh my, does the Avenging Son have any hope of stopping all-out war? Cameo appearance by the Thing. 32 pages. Cover price $0.15. Grade: CGC 9.4 explanation of grade Condition: Used (collectible)