Carl is seen as the trouble maker in Season 1, after almost facing expulsion. In Season 2, his love for selling drugs starts when his grandmother Peggy convinced him to get prescription drugs to make meth. Carl’s delinquent side is somewhat on hold in Season 3, but he does end up shaving his head due to his father, Frank Gallagher, convincing him that Carl has cancer. We see Carl's first love interest, Bonnie, in Season 4, but their relationship ends when Bonnie disappears with her family.