After the events of Crisis on Earth-X, Barry, and Kara find out that they have a daughter in the future, Alura Allen, who traveled to the past to try to fix her father's inevitable demise. Barry and Kara's relationship will be challenged by the following events. But through Soviets, Kasnians, and many other dangers beyond the thought of the common mand, they will resist, even for 1000 years. Based on Season 5 of The Flash and Season 4 of Supergirl. It is a SEQUEL to The Speedster and the Kryptonian.

Set during Crisis on earth X, Barry and Kara find themselves in the battle for their worlds against the New Reichsman regime threatening to conquer earth, will they succeed? Will their relationship be taken to the next level?