Played By: Shaun Sipos
A human who has travelled through space and time to warn Seg about Brainiac's coming and tell him about his future grandson.
- Adaptational Villainy: To save Superman, Adam will have to do whatever it takes to ensure his existence. Even if it means allowing Brainiac to steal Kandor, which would eventually lead to Krypton's destruction. Downplayed in that he is genuinely regretful about the necessity, and it becomes clear that he was right to be worried about the future being changed by Krypton surviving.
- Ambiguously Bi: Episode 1x05 has him checking out a male Sagitari guard's ass.
- He also says Seg has "dreamy eyes" and "legs for days".
- "Savage Night" hints at a failed romance with Alanna of Rann.
- Composite Character: In backstory and the fact that he is a time traveler, he more closely resembles Booster Gold than his comic counterpart.
- Fish out of Water: His clothes from Earth don't go unnoticed.
- Flipping the Bird: Gives his middle finger to Kem when the latter chases him away from behind his bar and asks the money for the drink he [Adam] stole. Kem likely doesn't understand the gesture, not being from Earth.
- Heroic Sacrifice: Just when Ona, having recently been turned into a living bomb, is about to kill Seg and his friends, Adam jumps in at the last second and blocks the explosion with his Zeta Beam, all while vanishing at the same time. Subverted in that he survives.
- Nice Hat: His Detroit Tigers baseball cap. Seg mistakes the "D" for a guild emblem. He reluctantly trades it away on Kem's advice so they can investigate a meteor impact outside the dome, complaining that the Kryptonian he traded it to isn't even a fan.
- Not Wearing Tights: He dresses in plain streetwear from Earth at first, then starts wearing a Rankless Kryptonian garb to blend in. He wears much more garish outfits in the comics. After having his legs paralyzed by falling rubble in the penultimate Season 2 episode, Val-El gives him the classic red suit and Jet Pack, along with leg braces, so he can keep fighting.
- Ominous Message from the Future: Warns Seg about the threat of Brainiac, and about what it's doing to Superman on Earth in the future he comes from. He also gives Seg Superman's cape.
- Status Quo Is God: He travelled back in time to preserve history and Superman's existence. However, this means that Krypton will die anyway for Superman to come to Earth as the infant Kal-El. He doesn't tell Seg about this, which causes a rift between the two.
- Teleporters and Transporters: Superman sent him because he can use a Zeta Beam to warp himself to Krypton's past from Earth, and he came alone because the Zeta Beam doesn't allow passengers when warping through time (it does when warping through space however).
- Token Human: Pretty much the only Earthling of the main cast, as well as the only human in the series.
- Unwitting Instigator of Doom: In their brief first meeting, he gives Seg a House of El sunstone from the future - Superman's own. Seg later blames him for his parents' deaths because of that sunstone.
Played By: Blake Ritson
Brainiac is a super-intelligent alien cyborg who has existed for thousands of years, possessing the intellectual plunder of countless advanced civilizations. He feeds his insatiable appetite for information by collecting worlds, putting billions of lives in stasis in the process.
- Arch-Enemy: To Superman, to the point where he goes back in time to destroy his world and prevent his birth. Except, as it turns out, he never went back in time; his arrival was part of history all along.
- Black Eyes of Evil: His eyes are a solid black with Matrix Raining Code when seen up close.
- Big Bad: Of Season One. He was indicated to be this in early promotional material. He forms a Big Bad Ensemble in Season Two with General Zod and Lobo.
- City in a Bottle: The first live-action appearance of his city-stealing gimmick. A shrunken city is visible on his ship in one of the first trailers.
- Composite Character: Visually, he's very much based on his post-2008 incarnation (including in the design of his equipment), but apparently he's supposed to be an android like the pre-Crisis incarnation.
- The Collector: Collects shrunken cities.
- Enemy Mine: In the Season Two premiere, he tries to team up with Seg, reasoning that they're both injured and need each other's help. Seg points out that Brainiac would try to kill him as soon as it became convenient, a fact Brainiac doesn't deny, and so decides to just skip the pretense and beats Brainac's body into pulp using a stick. Unfortunately for Seg, Brainiac survives by putting his mind into Seg's body.
- Evil Old Folks: He looks and sounds like an older version of the post-2008 version. Johns even notes that it was important that he appear "ancient".
- Evil Sounds Raspy: His voice is very raspy and weathered, fitting his incredible age.
- Fate Worse than Death: He claims that the inhabitants of each city he collects would live forever. That is technically true, however, his idea of eternal life in one of his "bottles" is pretty horrific. Everyone trapped inside is kept in a living stasis, unable to move, never aging, never dying, but trapped in the moment when time froze for them, stuck in place for all eternity...while still completely conscious and fully aware of their surroundings.
- Make Wrong What Once Went Right: He's come back in time to destroy Krypton and avert Superman's birth. In fact, Adam Strange is wrong about this. Brainiac was always meant to steal Kandor, which in turn caused the destabilization of Krypton and eventually led to Kal-El being sent to Earth.
- Outside-Context Problem: The society of Krypton puts a strict ban on even teaching the possibility that other life exists in the universe. Naturally, they are completely caught off guard when he finally arrives, especially because even for all its advanced technology, Krypton is in the Stone Age compared to the technology Brainiac possesses.
- Robotic Psychopath: An advanced android who destroys planets.
- Satanic Archetype: Fits the role as a harbinger of destruction who is obsessed with having everything under his rule by keeping worlds in bottled containers, essentially creating a "hell" for countless worlds. He also fits in with the Revelations take on Satan: a powerful entity whose arrival brings out the end of a planet's days and is obsessed with ruling his own private collection.
- Super Intelligence: Standard for Brainiac, and he likes gloating about it.
- Taking You with Me: As he's sucked into the Phantom Zone at the end of Season 1, Brainiac uses his tendrils to drag Seg along.
- Villainous Rescue: For a while in Season 2, he's in Seg's body and helps him survive with calculations and aiming. It's entirely out of self-preservation but still qualifies.
- Voice of the Legion: Along with being raspy, his voice is deep and reverbal.
- Where I Was Born and Razed: He wiped out his own people on Colu after they created him.
Played By: Emmett J. Scanlan
- "Name's Lobo!"
A space bounty hunter Seg and Adam Strange bump into.
- Ambiguously Bi: When he's not threatening Seg and Adam, he is commenting on their general attractiveness. He seems to like Adam in particular, referring to him as "a cutie" and "the hot blond". Adam seems genuinely flattered.
- Badass Beard: He sports his iconic goatee.
- Badass Biker: His biker look, which harkens back to his 1990s appearance.
- Big Bad Ensemble: He forms this in Season Two with Brainiac, whom he wants to defeat out of a personal grudge, and General Zod, whom he doesn't care about. However, he disappears from the plot after Seg and Adam escape, leaving the expelled Brainiac behind for him to kill, and when he resurfaces in the finale, arriving on Krypton after Zod has already been overthrown, he forms an alliance with Seg to hunt down Brainiac for good.
- Dreadlock Warrior: He sports impressive dreads.
- Eerie Pale-Skinned Brunette: True to the comics, his skin is stark gray-white to contrast with his black leather.
- Genre Refugee: Krypton is a pretty serious sci-fi show overall. Enter Lobo, THE Bloody Hilarious Amusing Alien, in Season 2.
- Guttural Growler: His voice is usually rather soft and high-pitched, which has never been the case for Lobo before, but it drops into the more familiar growl when he gets especially angry.
- Half the Man He Used to Be: Not from getting bisected, unusually for the trope. To get past the force field door Adam Strange activates, Lobo blows his own head off, then regenerates his whole body from his severed hand that's on the other side. When his torso, head and arms are regenerated, he goes after Seg and Adam, not bothering to wait for his legs to regrow.
- Hand Cannon: His blaster handgun is huge, yet he's human-sized and uses it with one hand.
- Healing Factor: Getting a basketball-sized hole blown through his torso is a mere inconvenience, as it takes him only a few minutes to regenerate. In the following episode, he shoots his own head off so his body will regenerate from a severed arm on the other side of a forcefield.
- Hooks and Crooks: As in the comics, he uses a chain with a hook.
- Implacable Man: No matter what Seg and Adam Strange do against him, he can't be stopped on Colu. The only solution they have after getting Brainiac out of Seg's body is to teleport away with the Zeta Beam.
- Red Eyes, Take Warning: He always has them and is most definitely not someone to be underestimated.
- Skeletons in the Coat Closet: He has a skull ornament on his crotch.
- Where I Was Born and Razed: He destroyed his own species for laughs. Brainiac then blew up his planet after stealing a city, which really annoyed him because he had the place just to his liking.
An army of winged humanoids Nyssa-Vex bumps into while searching for Sardath on the planet Rann.
- Ambiguous Situation: They could be either Parademons or Thanagarians. Only a third season could give a clear answer, but, unfortunately, the show has been cancelled and it's Left Hanging. To elaborate:
- The Omega symbol Nyssa finds might imply they are indeed Parademons (foot soldiers of Darkseid).
- Characters who were rumored to appear in the show and eventually didn't included Hawkwoman. Additionally, in the comics, Rann and Thanagar are very close together in space, and that closeness tends to result in war between the planets.
- Sequel Hook: They're obviously a hook for Season 3, which Syfy cancelled.
- Winged Humanoids: Their silhouettes are clearly humanoid, and they have wings.