Avengers (1963) #243
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Earth's Mightiest Heroes joined forces to take on threats that were too big for any one hero to tackle. With a roster that has included Captain America, Iron Man, Ant-Man, Hulk, Thor, Wasp and dozens more over the years, the Avengers have come to be regarded as Earth's No. 1 team.
The youngest son of Mentor and Sui-San, Eros had the natural ability to excite pleasure in others, but his power had no effect upon his mutant older brother, Thanos, who worshiped the cosmic embodiment of Death and led an army against Titan.