WARNING: If you don't want to know what happened in this episode, don't read this photo recap!
Remember that time that a full-grown man about to die by Lyta's hand told her he was her son? Right. So Adam comes in, and recognizes him as General Zod — Superman's greatest enemy. He's also from the future, which makes the mother-son relationship less creepy.
With a gun pressed up against his chest, General Zod starts talking. He knows some Kryptonian history: Brainaiac isn't from the future – he's from the present, come to destabilize Krypton by staging a coup in Kandor. This sets the works in motion for Krypton to eventually explode, a fact Seg isn't pleased Adam hid from him.
Seg and Lyta tie both Adam and General Zod up, and ask for some answers. Zod is in quest of a weapon so powerful that even Brainiac is defenseless before it. It's somewhere close to the Superman sigil and Seg knows where that is. The cavedwellers in this place are guarding it, though.
During an absolution ceremony, Daron-Vex pardons a rankless Black Zero member who just received his unction. This is against protocol. But this person will eventually be framed for the murder of Rao, and they needed to separate him out. Sneaky sneaky.
The Voice of Rao, hijacked by Brainiac's sentry, offers "eternal life" to little Ona. That would entail him uploading her into his head, just like all the other intelligent lifeforms he's acquired. She needs to sleep on it.
Remember that little stunt back at the ceremony? Well, Daron isn't pleased with how Jayna handled it. Pardoning the rankless was too public, too drama. And considering that they're going to be blowing Rao up at a special ceremony, the last thing they need is premature fireworks.
Dev-Em, who's planted the bomb that's going to blow Rao sky-high, enters the godhead's chambers, and informs him it's officially showtime. But Rao has a slight change of plans: he wants there to be lots of people at the ceremony. People + explosion = mass casualties. Let's see how Dev-Em gets out of this one.