A young and gifted crime scene investigator is imbued with extraordinary speed and rapid healing after a freak laboratory accident. As he begins to explore the limits of his new powers, he dons the mantle of a scarlet speedster, becoming a vigilante hero while keeping his identity secret. However, he soon discovers that he is not just fast—he can also manipulate the very fabric of time and space. With a hunger for justice and a heart weighed by personal tragedy, he resolves to use his abilities to right wrongs and protect the innocent.

While coming to grips with his incredible capabilities, a dimensional rupture pulls him into an alternate reality, where he encounters different versions of the world he knows and different iterations of friends and foes alike. Here, he finds an aged and battle-weary version of a caped crusader, and a fiery new ally with her own set of superpowers. They join forces in a perilous quest to restore balance across fractured timelines, battling a formidable adversary who also wields the power to alter reality. The pursuit of peace across multiple dimensions pushes the limits of their abilities and their understanding of what it means to be heroes.