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Sub-Mariner is informed that Tiger Shark has been seen near the Sargasso Sea and he makes his way out there. He confronts Tiger Shark who has allied himself with a group of Immortals bent on ruling the world. However, when the Immortal leave the mists of the Sargasso Sea, they begin to age instantly and die. Tiger Shark attempts to unleash a deadly virus, but Namor and the sacrifice of Dr. Newell ensure that it causes no harm. Unfortunately, Tiger Shark escapes, but Sub-Mariner vows to kill him when they next meet.