Prologue

Set several years in the future, Kara Danvers (Supergirl) must now mentor her friends children to help them protect Earth-Prime. Mia Queen (Green Arrow), Nora West-Allen (XS) and William Clayton are all helping Kara protect Earth-Prime. But what happens when something dark that none of them expected comes to light. Who come back to help them? Who is the threat? Will they win?

All rights to Greg Berlanti, The CW and DC.