Bartholomew Allen II

Bartholomew Allen II is a teen with super speed.

History
Bart Allen is a teenage speedster and a member of the Flash Family who has gone by a number of aliases. He was born in the 30th Century to Don Allen and Meloni Thawne, the grandson of time-traveling speedster the Flash, although he returned to the past to continue his family's legacy. He suffered from an illness that made him aged at an inconsistent rate. Originally, he took the name Impulse to reflect his impulsive nature, but later changed his alias to Kid Flash when he joined the Teen Titans. There was a brief period when he became The Flash after Infinite Crisis, but he was killed by the Rogues during Full Throttle. Later on, he was resuscitated during Final Crisis through his connection to the Speed Force and has returned to his role as Kid Flash since then.

Young Justice
Bart took the alias of Impulse and started a team with Superboy and Robin.