The Black Dragons were a notorious biker gang that operated out of San Francisco's Chinatown. They would be put under the mental control of international terrorist Yellow Claw who would use them in an attempted assassination of his arch-nemesis, FBI Agent Jimmy Woo. Woo would defeat his attackers with the aid of the super-heroes Marvel Boy and 3-D Man. Marvel Boy would use his telepathic abilities to read the bikers minds and learn of Yellow Claw's involvement in the attack, prompting Woo to gather a team of heroes called the Avengers to battle Yellow Claw.
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