He originally fought Allen when he was Impulse, and then when Bart aged five years after Infinite Crisis and became the Flash, Inertia fought him again.
Later when Bart aged five years after Infinite Crisis and became the Flash, Inertia fought him again. He originally fought Allen when he was Impulse.
He originally fought Allen when he was Impulse. Later when Bart aged five years after Infinite Crisis and became the Flash, Inertia fought him again.
He originally fought Allen when he was Impulse. Later when Bart aged five years after Infinite Crisis and became the Flash, Inertia fought him again.