Barry Allen , his grandfather and legendary speedster who had sacrificed himself against the battle with the Anti-Monitor , had also returned from the grave .
In The Flash : Rebirth storyline , Bart quickly discovers that things had changed significantly since he had been away .
Barry Allen , Bart 's grandfather and legendary speedster who had sacrificed himself against the battle with the Anti-Monitor , had also returned from the grave .
In The Flash : Rebirth storyline , Bart quickly discovers that things had changed significantly since he had been away .