Crisis Expansion Pack 1 and 2 reimagine the eight Super Heroes from the original DC Deck-Building Game and the eight from Heroes Unite with Crisis versions for cooperative play. In addition, the Super-Villains from those games and some new ones have been upgraded to Impossible Mode, making them much more difficult to defeat. There are even six new oversized Super Heroes in each expansion to go along with all the new main deck cards! This is not a stand-alone product. Requires any DC Deck Building Game base game to play.