Fallen Angels formed after Sunspot accidentally injured fellow New Mutant Cannonball, during a soccer game. The debut in Fallen Angels #1 (December 30, 1986). Shunned by his teammates, Sunspot left the team and was followed by the techno-organic alien entity Warlock. While living on the streets, the group befriended a young Korean girl named Chance, who had the ability to randomly enhance or inhibit the abilities of other mutants and Ariel, a teleportor that could turn doors into temporary gateways with her powers. Ariel and Chance lived with the longtime X-Men villain the Vanisher, who had reinvented himself as a Fagin-style mentor to a group of pickpockets that included Chance and Ariel. They were soon joined by Multiple Man and Siryn, two X-Men allies who were sent to locate the wayward New Mutants, and Vanisher's former star thief Boom Boom, whom Ariel recruited after a fight with Iceman. The group soon picked up several additional non-mutant members, a cyborg named Gomi and his two cybernetically enhanced psychic lobsters Bill and Don, and Moon-Boy and Devil Dinosaur, the later of whom accidentally stepped on and killed the psychic lobster Bill. It is eventually revealed that Ariel is an alien, from a planet called Coconut Grove, which had ceased to evolve and reached a genetic dead end. Ariel's superiors sought to remedy that situation by studying mutation in other species. Taking her friends to visit her planet, the team is captured by Ariel's superiors for vivisection. Ariel herself was then betrayed, as it is revealed that she herself was a mutant: possessing a persuasion ability unlike any other members of her race. Gomi, whose abilities as a cyborg were unaffected by mutant inhibitor fields, was able to escape his cell and free the others, and Ariel used her persuasion ability to convince the Coconut Grove to let them leave peacefully. Returning home, Sunspot and Warlock declare their intention to rejoin the New Mutants and leave the group, while Siryn and Multiple Man decide to stay alongside their new friends.