- Tom King
- Jason Fabok
- Jason Fabok
- Brad Anderson
- Deron Bennett
- Saturn Girl [Imra Ardeen Ranzz]; unidentified Arkham patients; unidentified Arkham orderlies; Batman [Bruce Wayne]; unidentified news anchor; unidentified hockey announcer (voice only); Farfanick (hockey player); Bungay (hockey player); Taylor (hockey player, death); Shuster (hockey player); other unidentified hockey players; unidentified hockey referee; Batman [Thomas Wayne] (from the Flashpoint universe); The Flash [Barry Allen]; Samuroids; Professor Zoom [Reverse-Flash; Eobard Thawne] (death)
- Saturn Girl, currently a patient at Arkham Asylum, correctly predicts the death of a hockey player. In the Batcave, Batman is examining the smiley face button that was left behind when Wally West appeared to him from the speed force, and he sees a vision of his father as the Batman in the Flashpoint universe. Batman calls The Flash for assistance, but Professor Zoom arrives first and attacks Batman. With Batman beaten and injured, Zoom takes the button and abruptly vanishes. He re-appears moments later and collapses dead.
- Batcave; hockey; smiley face button
This story continues in The Flash #21 (2016 series).
Story credits include special thanks to Geoff Johns and Joshua Williamson.
Batman first discovered the smiley face button in the Batcave after Wally West reached out to him from the Speed Force in DC Universe: Rebirth #1 (DC, 2016 series). Also in that issue, we saw Saturn Girl in the 21st Century in the custody of the Gotham Police, who were holding her for mental evaluation because of her claims of being friends with Superman and claiming to know the future.
Batman and The Flash previously agreed to investigate the button and the disruption to their timeline that Wally revealed to them, as shown in Flash: Rebirth (DC, 2016 series) #1.
The letter to Bruce from his father Thomas that had been brought back from the Flashpoint universe by Barry Allen (as shown in the Flashpoint DC 2011 mini-series) was destroyed in this issue by Professor Zoom.