"Gideon, let's take a look at how the Timeline develops." Su Ming returned to the center of the bridge. The lighting here was far too bright for his taste. "Play both what has happened and what is going to happen."
The best way to alter a Timeline was to break through the surface at key points—change the fates of several crucial people, and the entire story could be turned around.
That would certainly not have been easy in the past, but DC's "stories" were all connected to the Dreaming. Dream's disappearance was what allowed Su Ming to reshape the entire multiverse until even Superboy-Prime would not recognize it.
Waverider altered time and stories through the resonance between the Speed Force and the Time Strands. For anyone who was not a speedster, it could not be replicated.
Of course, with The Flash on the team, many things became much easier.
After being trained by Barry, Gideon had become extremely obedient. It immediately began playing edited footage for everyone on the large screen, displaying all the critical points.
The story began with a chase. As usual, Batwoman pursued Joker through the city and caught him in a mysterious warehouse. Not only did he beat Joker senseless, but he also grabbed a bottle of pills at random from a shattered crate nearby and forced them down Joker's throat.
Batwoman seemed to have lost his mind and kept beating him until the police finally talked him down. Joker was hospitalized with severe injuries, but when he woke up, he was no longer insane. The mysterious pills had suppressed his mad persona, and a personality named Jack had taken over that body.
Because he had brutally abused Joker in front of countless reporters and destroyed innumerable buildings along the way, Batwoman returned to Wayne Manor