This section of the history takes place during Flashpoint, a massive crossover event set in an alternate timeline to the mainstream DCU. History was completely changed when Professor Zoom finally found a way to erase his nemesis the Flash without harming his own legacy.
Rathaway was also a childhood friend of Wally West. When he visits his friend he finds Wally has been murdered. Rathaway then follows the evidence of to discover Citizen Cold's secret identity. Rathaway tries to rescue his friends aunt Iris West from the Rogues but was apparently killed by a explosive ice sculpture. He was later revealed to have survived, and tells Iris about the murder of her nephew. Rathaway threatens Citizen Cold to surrender or he will reveal his identity to the world, but he refuses and Iris freezes him in place with his own Freeze Gun.
- Mute: Citizen Cold destroyed Piper's vocal chords in one of their earlier battles, forcing him to forever talk through an electronic device in his mask. 
- 3 Appearances of Hartley Rathaway (Flashpoint Timeline)
- 3 Images featuring Hartley Rathaway (Flashpoint Timeline)
- Quotations by or about Hartley Rathaway (Flashpoint Timeline)
- Character Gallery: Hartley Rathaway (Flashpoint Timeline)