<Li> Zachary Gordon as Greg Heffley . </Li> <Li> Robert Capron as Rowley Jefferson, Greg's childish best friend . </Li> <Li> Devon Bostick as Rodrick Heffley, Greg's older brother . </Li> <Li> Steve Zahn as Frank Heffley, Greg's father . </Li>

Who plays rodrick in the first diary of a wimpy kid