Warning: The following contains spoilers for Krypton
Based on the events of tonight's episode, Syfy's Krypton may be poised to introduce yet another Superman villain before the end of the first season, and it may actually be the Man of Steel's archenemy, Lex Luthor. Whether it's Luthor or another character, this would be the show's fourth major Superman villain.
In the series premiere, Brainiac was presented as the show's big bad. According to Adam Strange (Shaun Sipos), Brainiac had traveled from the future to the distant past to destroy Krypton and prevent Superman from being born. At the end of the fifth episode, a second Superman villain made his debut in a surprising twist: General Zod (Colin Salmon). Superman's murderer, Doomsday, debuted in tonight's episode as the show's third Superman villain.
General Zod's introduction has proven to be a massive game changer for the series. This was demonstrated in tonight's episode when we learned that Adam Strange came to the past on the incorrect assumption that Brainiac was the one looking to erase Superman from existence. In the episode, Zod explains that Brainiac's plan to attack Krypton is simply part of the natural timeline. What this means is that someone else besides Brainiac and Zod wants Superman removed from history.
Superman has a deep rogues' gallery that Krypton could pull from. With Zod, Brainiac, and Doomsday already introduced, there are few villains who could be behind the conspiracy that wouldn't seem underwhelming. The only villain who could be more well known to Superman fans than those three is Lex Luthor. Getting rid of Superman without having to actually defeat him physically does sound like something Luthor might try.
Following this reveal, Krypton may have dropped a hint as to how this scheme could manifest. In criticizing Daron-Vex (Elliot Cowan), Jayna (Ann Ogbomo) mentions that Daron "came out of nowhere" two decades ago and married into the Vex family. This means that Daron, the man who had Seg's grandfather executed, was originally an outsider. Is it possible that he too is a time-traveler? If so, he could be an agent of Lex Luthor sent to ensure the end of the El family. There's also the slim chance that Daron-Vex is Lex Luthor himself, though, as it seems unlikely that Luthor would spend twenty years of his life on an alien planet trying to stop Superman from being born.
It's more likely that if Luthor is the real villain of the series, he's still in Metropolis, waiting for his plan to play out. Since Krypton will eventually visit Earth, we may find out then if Luthor is the one responsible, or if another Superman villain is secretly pulling the strings.
Krypton continues Wednesday, May 2 on Syfy.