Upper Deck Entertainment builds upon its relationship with Marvel Entertainment with the April 2008 release of a new multi-player superhero trading card game made especially for kids. Marvel Ultimate Battles will feature characters from Marvel comics and films, such as The Hulk, Iron Man, Captain America, and Spider-Man. The trading-card game features two starter sets, each themed either around The Hulk or Iron Man, and 48 cards, including an Ultimate Rare card, a fold-out playmat and rulebook. Booster packs will consist of nine cards per pack, complete with common, rare, and Ultimate Rare cards. There will be 165 cards total in the set.