"The Rookie" follows Lightning McQueen’s origin story, told as a flashback in a talk show with RSN. Set before the events of Cars, this comic recounts Lightning’s days as ‘Bulldozer’ McQueen and other moments that changed the hot-shot rookie racecars’ life. The issue, which you can get on May 2nd, 2009 only (while supplies last), is excerpted but includes never-before-seen sketches, character designs and script pages! Check out a preview of the comic, which looks great and stays true to the movie, over here. Use the store locator to find a participating location near you.
Also browse through the Free Comic Book Day site to discover some other interesting comics you can sample for free, including the "Gold Comics", one of which is Cars itself!