Sebastian and Barry Allen are the twin sons of Henry and Nora Allen. After the incident, they were separated. Barry going the the Wests while Sebastian went to his godfather Alex Smythe. This is the story of what happened to the two young boys separated by a tragedy.

In an alternate universe both Barry and Kara exist together. This is what happens when they meet in college and fall in love. Follow them, their family, and friends through life from college years to being superheroes and beyond. This is Karry Universe. Leading the Millma Verse.