Friends and fans of Roger Slifer are asking police and the public for their help in tracking down the hit-and-run driver who ran down Slifer in a Santa Monica intersection, leaving him in critical condition. Police say the animation and comic book veteran was crossing 5th Street early Saturday morning when he was mowed down by a white sedan with tinted windows. The driver fled and Slifer remains hospitalized. Slifer, a member of The CPL Gang, began working for Marvel in the mid-1970s, moving to DC Comics in 1981. He later transitioned into animation, working for Sunbow Entertainment as a producer, story editor and writer on series including Jem And The HologramsTransformers and G.I. Joe Extreme.