Inertia (DC Comics)
Inertia is a comic book character in the DC Comics universe. He is a clone of Bart Allen, aka Impulse (now Kid Flash), and was created in the 30th century by Bart's maternal grandfather, President Thawne. Thawne, being the descendant of the Flash's enemy Professor Zoom, got tired of his grandson's crime fighting activities in the 20th century and decided to create a clone of Bart using more Thawne blood so that he would be more ruthless. His mission as the "Reverse-Impulse" was to go back in time and replace Bart, but he was easily defeated.