Saw this online and a question popped in to my head. If Superman, Doomsday, & Darkseid were fighting each other at the same time AND Superman didn't hold back at all, for
Everything You Need to Know Ahead of “Doomsday Clock” - Superman Homepage
First Look at Doombreaker from “Death of Superman” Anniversary Special - Superman Homepage
Doomsday Clock #7 reveals how Doctor Manhattan changed the DC Universe - Polygon