Following WrestleMania III, the World Wrestling Federation (WWF, now WWE) added Survivor Series to their pay-per-view calendar in November to market the success of Hulk Hogan and André the Giant's rivalry. The 1987 event was characterized by featuring only tag team elimination matches that were dubbed Survivor Series matches. Of the four matches at the event, three pitted teams of five wrestlers against each other, while the other featured five tag teams against each other (totaling 10 wrestlers per team), but with the stipulation being that if one member of a tag team was eliminated, both members of that particular tag team were eliminated. A second Survivor Series occurred the following year, establishing the event as an annual November pay-per-view, becoming one of WWF's original four pay-per-views, along with WrestleMania, Royal Rumble, and SummerSlam, which were eventually dubbed the "Big Four". It has also since become the second longest running pay-per-view event in history (behind WrestleMania).