Real estate agent Arthur Douglas, his wife Yvette, and daughter Heather, were driving across the Mojave Desert from Las Vegas to Los Angeles when a spaceship carrying the mad Titan named Thanos passed overhead on a surveillance mission to Earth. Wishing to keep his existence a secret, Thanos destroyed the automobile in case its passengers had seen his ship, and then landed to make certain they were dead. Satisfied that they were, Thanos left. Unknown to the Titan, his father Mentor had been monitoring his activities on Earth to examine his son's latest handiwork. Mentor discovered that Heather Douglas was still alive, and took her back to Titan to be raised. She later returned to Earth as Moondragon. (Sourve: Marvel Database)