Believed to be about the Flashpoint comic book storyline where Barry Allen (a.k.a. The Flash) wakes up in an unrecognizable world. He doesn't have the super speed power anymore and the Justice League doesn't exist.
In San Francisco, a Chinese-American boy is forced to hone his skills in ancient Chinese magic. When his grandmother who raised him is overtaken by enemies, the boy becomes guardian of a phoenix egg that controls the fate of good and evil and allies himself with a tiger capable of turning into a human form.