Professor Zoom
During their time in the future, they conceive the Tornado Twins, Don and Dawn. Don marries the descendant of Professor Zoom, Meloni Thawne, hoping to end the feud between the two families. They have a son, Bart, whose powers manifest at an early age and cause him to age at an accelerated rate. Dawn marries Jeven Ognats of Aarok and has a daughter, Jenni. Her powers eventually manifest when she witnesses her father being tortured, and she becomes XS of the Legion of Super-Heroes. Don and Dawn die saving 30th century Earth from an invasion by the Dominators.