During the Crisis on Infinite Earths, several migrants came from extinguished universes to two of the five remaining core universes remaining. Four of them would be prominent in the annals of this epic tale. Where were they from and what became of them afterwards:
- Pariah was a scientist named Kell Mossa of Earth-Omega who sought to see the beginning of everything, and instead unleashed the Anti-Monitor from his age old slumber... thereby dooming Kell's home world. Given powers by the villain's doppleganger, the Monitor, to teleport to and from danger unharmed. Mossa as Pariah was instrumental in saving the Multiverse. Then he moved to Earth-One.
- Tashana aka Lady Quark of Earth-Six was part of that world's royal family, trying to save it from the Anti-Monitor's destructive wave, and only found herself saved due to Pariah's unwanted intervention. She moved to Earth-One during the Crisis.
- Alexander Luthor was the son of Earth-Three's sole superhero and his wife, Alex and Lois (Lane) Luthor. Preserved alive as a baby by his father in dimensional-traversing vessel when his world was destroyed, the infant arrived on Earth-One aboard the Justice League's old satellite base. He along with the last migrant would journey to an Earth-Two pocket realm after the Crisis was finally over.
Following the Crisis, there were alternate timelines. During a subsequent Crisis engineered by Luthor and Superboy Prime, the Multiverse was recreated including the home world's of Kell, Tashana, Alexander and Clark. Undoubtedly, all four would seek to return to realms of their birth to rejoin their loved ones, with whom they were tragically separated from years prior.