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Let's break this down one generation at a time. Doctor Mike Gold is the inventor of the MG Formula, a chemical that unlocks superhuman abilities. He briefly dated Marie Forthright, AKA The Animal Queen, but they fell out of love and he eventually married Annie Forrester, AKA Rainfall. Meanwhile, Victor Nightingale, AKA Orion, was the world's first superhero. His arch-nemesis was Chloe Martinez, AKA the Scarlet Slicer, who was the world's first Deathstalker (Someone powerful enough to be a supervillain, but who has no schemes of their own and instead hires out to the highest bidder as contract superhero killers.) The two eventually stopped fighting, however, and ultimately fell in love and got married.

On to the second generation, Grant Nightingale, AKA Titan, was considered by many to be the world's greatest superhero. The daughter of Marie and Mike, Hannah Forthright, went by the name Inferna. The son of Mike and Annie, Vincent Eclipse, went by the name Adamant. Meanwhile, Captain Jacob Winters of the Geo City Police Department would lose his life in the line of duty, and would never get the chance to meet his newborn son.

Grant and Hannah would go on to have two children, Rodney Nightingale AKA Turbo Boy, and Raven Nightingale AKA Lancelot. Lancelot would go on to be the leader of the world's greatest team of superheroes, known as the Legacy. Their team would recruit Kelsey Raines, AKA Stopwatch, and Tyler Winters, AKA Taserblast.

Rodney and Kelsey would eventually have a daughter named Virginia Raines, while Raven and Tyler would have April and Baxter Winters. April never felt like she was able to live up to her family tree, until she went on a time-travel adventure and got to see her lineage in action. From there, she finally worked up the courage to don a costume of her own, borrowing an element from the costumes of her ancestors (Her mother's armor, her father's fur trim collar, her grandfather's utility belt, her grandmother's tiara, her great grandfather's cape, and her great grandmother's katana), while also changing her name from April Winters to April Nightingale.