Serac
The main antagonist of season three, Serac essentially ruled the world through the Rehoboam computer, which dictated the lives of basically everyone on Earth—including Serac himself, to maximize his success. Unfortunately for him, Caleb destroyed Rehoboam, and Maeve stabbed him with her katana. It could have been a fatal wound, as there’s been no word that Cassel is coming back for season four… but if he is, he’s still the majority shareholder of the Delos company, which could mean all sorts of trouble.
