Following the events of Justice League, Kara finds out that her home world was not destroyed naturally, but was destroyed by a powerful android, Brainiac. Meanwhile, Clark is dealing with the mess that Lex Luther and Mercy graves has left. While doing so he discovers Cadmus, and fids out a shocking secret. What is this secret that Clark found? How will Kara avenge her planet? And will Clark and Kara defeat his new threat?
