User blog comment:Codytlane/PE Proposal: Brainiac (Injustice)/@comment-26921356-20190818035125/@comment-40024294-20190818223028

Well, that was the whole reason Batman and Superman turned on each other again. Supes wanted him dead and they would figure out how to bring the cities back with Cyborg while Batman wanted him alive so they could force him to revert them back. Tho its clear in the supes ending that there was more he wanted (or the ship's power corrupted him, idk), but given how its very likely the Batman ending is canon, Brainiac is alive (probably to return in Injustice 3).