2.9

The 2.9 update introduced the following:
 * Catwoman/Arkham Knight
 * Solomon Grundy/Earth 2
 * Doomsday/Blackest Night
 * Alien Invasion Booster
 * Sorcery Booster
 * Ice Breaker Booster
 * You can now replenish your characters' energy by watching video(s)!