Godspeed first makes an appearance during one of Barry Allen's visions, claiming he would kill everyone.^[1]

August Heart is a colleague of Allen from the Central City Police Department. Heart's brother was murdered by a career criminal and his killer was let free due to the evidence being destroyed when Barry's lab were struck by lightning. When August confronts the Black Hole, a group who had stolen a van containing equipment from S.T.A.R. Labs, he recognizes their symbol as the same one spray-painted near his brother's crime scene. August is shot at but before the bullet could hit him or Barry could save him, August is struck by lightning from a Speed Force storm. Now a speedster, August knocks out his shooter. After Barry reveals himself to be the Flash, August creates his own costume and becomes Barry's partner, also wishing to use his powers to solve his brother's murder. After defeating Black Hole, they witness another Speed Force storm strike more citizens, turning them into speedsters.^[2] August helps Barry round up any new speedsters who use their newfound powers as criminals. The two meet Dr. Meena Dhawan, a new speedster who has helped create a Speed Force training center to help the new speedsters control their powers. When Barry and Meena return after recruiting more speedsters, they find the injured August who tells them that a new speedster called Godspeed killed the speedster criminals and took their speed. A recovered August brings two of the recruits with him in order to storm the Speed Force storm-infused Dr. Carver. After Barry and Meena's 'day off', Godspeed arrives at the training center where he is confronted by Meena. As Avery Ho, one of the speedster recruits, escapes to get the Flash, Godspeed kills Meena and two of the recruits and takes their speed.^[3]

When Godspeed kills Billy Parks, the main suspect in August's brother's murder, Barry realizes that August is Godspeed. Barry confronts him and August reveals that he is indeed Godspeed and had given up on the justice system, deciding to become judge, jury and executioner, killing his brother's murderer. August reveals that when he was near the speedster criminals, he could feel the Speed Force within them connecting with him. He decided to take their powers from them, resulting in their deaths and August being injured. After realizing that it was possible to siphon another speedster's speed without killing them (evident when he, Barry, Meena and two recruits took Dr. Joseph Carver's speed), August tried it again on Meena and the two recruits. However, it had the same results as the first time. With his increased speed, Heart reveals he can create a double of himself and be at two places at once, though it takes a physical toll on him. Barry uses this to his advantage and escapes. August proceeds to interrogate the other Black Hole members about his brother's death, but kills them all when he receives no information. When the speedster recruits safely give their speed to Barry and Wally to stop Godspeed, August arrives and is able to take Avery's speed. Barry chases after Godspeed who reveals that he will head to Iron Heights and do the one thing Barry could not, kill his enemies, including Eobard Thawne. However, Kid Flash (Wallace West) intervenes and helps the Flash in taking down Godspeed, who is later incarcerated in Iron Heights. It is not known whether August still maintains a connection to the Speed Force, as it was hinted that all who were hit during the Speed Force storm's powers may be temporary.^[4]

August later teams up with the Flash and the Reverse-Flash to stop the villain Paradox from erasing all of the Flash's history. After Paradox is defeated, August asks Thawne if, given the latter's extensive future knowledge of the Flash, he knows who killed August's brother. Thawne gleefully admits being his brother's killer and snaps August's neck, killing him.^[5] When Reverse-Flash is defeated, Godspeed's death is undone.^[6]

During the "Titans: Beast World" storyline, Godspeed is exposed to the Beast Boy spores and transformed into a humanoid hornet. When Godspeed nearly kills Jai West, his date Maxine Baker saves him. Godspeed later went on a rampage at Iron Heights but is defeated by the Flash family, who had willingly mutated themselves into bee hybrids.^[7]

In addition to abilities shared with other speedsters, Godspeed has the ability to forcibly take another speedster's speed. This is done by running around a speedster (or speedsters) at extreme speed, resulting in Godspeed gaining their speed, but at the cost of injuring himself and killing any victim or victims not willing to give up their speed. However, Godspeed was able to take Avery's speed without killing her, and Barry and Wally were able to take the speed from several speedsters safely.

Godspeed also has the ability to create a clone of himself by dividing the Speed Force in him. However, extended use of this clone will result in intense pain, and the copy will then destabilize, with its portion of the Speed Force returning to the original Godspeed. Like other speedsters, Godspeed can run up to 10 times the speed of light by entering the Speed Force.

August Heart / Godspeed appears in The Flash, portrayed by Kindall Charters in the fifth season, Ryan Handley in the sixth season, Karan Oberoi in seventh and ninth seasons, and voiced by BD Wong in the fifth and sixth seasons^[8] and Rick D. Wasserman in the seventh season.^{[citation needed]} This version is a scientist from the year 2049 who uses tachyon technology to replicate the Velocity drug to give himself super-speed and became an enemy of XS and Impulse. Following his introduction in his self-titled episode, Godspeed travels back in time to gain "infinite velocity", only to fracture himself into two warring drone factions while the prime Godspeed loses his memories. The drones engage each other in a "Godspeed War" until the prime Godspeed receives organic speed from the Speed Force, allowing him to absorb the drones in an attempt to become a god, only to be defeated by the Flash and the Reverse-Flash, incarcerated, and lose his memories once more. In the series finale, Cobalt Blue recruits a version of Godspeed from another time period, among other speedsters, to help him seek revenge on Team Flash. However, Godspeed is defeated by Virtue and returned to the time period he was pulled from.