We were all so powerless. I know. I never want to feel that way again. No one should. But...

Supergirl: [telling Superman about Brainiac] We were all so powerless. Superman: I know. Supergirl: I never want to feel that way again. No one should. But if that thing's here, it's all going to happen again. Superman: No. I'll make sure it doesn't. Supergirl: You're going after him, aren't you? Kal, you don't know what you're dealing with. Superman: These probes must be how he searches for planets. And if this one didn't contact him, someday one will. I need to finish what your father started. Isolate this robot's comm signal, scan for others like it, and find Brainiac first. Plus, if you're right, there could be a hundred thousand Kryptonians alive and trapped on that ship. Supergirl: And what if he shows up while you're gone? What if you never come back? Superman: You'll have to keep things safe here until I come back. Supergirl: What makes you think I'm ready to do that? Superman: You'll have to be.