SummerSlam is an annual pay-per-view, produced every August by World Wrestling Entertainment (WWE) since 1988. Dubbed "The Biggest Party of the Summer,"[2] it is one of the promotion's original four pay-per-views, along with WrestleMania, Royal Rumble, and Survivor Series, dubbed the "Big Four".[3] It is considered WWE's second biggest event of the year behind WrestleMania.[4][5] 2003 was the sixteenth event in the SummerSlam chronology and featured wrestlers from the Raw and SmackDown! brands.