It’s been announced that Odette Annable has been cast in the role of Reign. Who is Reign? This is the baby that was put in the pod at the end of Season 2 Episode 22 “Nevertheless, She Persisted” and sent to earth to reign.
In the DC Comics World Killer storyline, the character is a Worldkiller. Reign was taken as an infant by Kryptonian scientists who gave her new abilities. In the comics Reign becomes an enemy of Supergirl when she arrives on Earth with a plane to conquer it (she should talk to Rhea about that..no wait, she can’t…poof! poor Rhea)
Andrew Kreisberg said the following on behalf of himself and Greg Berlanti:
“Greg and I have wanted to work with Odette for years. We are beyond excited to have her join our cast in the scary, powerful and heartbreaking role of Reign,”
This is all just dandy right? Another alien wanting to take over the world but there is more to this character that just that. Kara’s father, Zor-El had a part in creating the Worldkillers before they were banned by the Kryptonian Science Council because that’s an awful thing to create, right? Right. Zor-El felt guilty about his part in creating this world extermination group and he tried to destroy them as he was ordered to do so but he was unable to do it.
Now Reign is sent to earth as a baby and she is the leader of the surviving Worldkillers but doesn’t know how she was created or where she comes from. She goes in search of Supergirl for answers but Kara doesn’t know either. So what does she do? Well she tries to take over Earth.
So that’s what we know about Reign.