|This article is written from the Real World perspective|
Impulse would have been the team's sole speedster, as the Flash was not part of this early lineup.
In the comics, Bart Allen is the son of Don Allen and Meloni Thawne, making him the grandson of Barry Allen (the second Flash) and a descendant of Professor Zoom (Eobard Thawne, the Reverse Flash and enemy of Allen). His birth in the 30th century ended a feud between the family that had started in the 20th century. When most of his family was killed in the Dominator invasion of Earth, his grandmother Iris West Allen took care of him, but Bart's super speed abilities caused him to age considerably faster than the other Flashes. Returning to the 20th century, Iris had Wally West (her nephew) teach Bart how to control his speed before it killed him. He adopted the name "Impulse" as he refused to take the name "Kid Flash" (which he eventually did, after forming a new group of Teen Titans with Robin, Superboy, and Wonder Girl II). During the Infinite Crisis, Bart and Wally managed to push the rampaging Superboy-Prime in the Speed Force, but Prime escaped hours later (speed force time). Bart, now an adult, went back to Earth to warn the heroes, taking on the mantle of the Flash when Wally and his family disappeared. Bart's comic run as the Flash was not popular and Bart was killed by Inertia and the Rogues when Inertia severed his connection to the Speed Force and the Rogues finished him off with a combined attack. Bart was revived in the Final Crisis: Legion of Three Worlds miniseries, and joined the Teen Titans again as Kid Flash.