It feels like the Titans have been working nonstop to defeat Deathstroke and his crime syndicate, and the team could use a breather. What better time for Beast Boy and Cyborg to go check in with Gar's first found family — the unstoppable Doom Patrol? But the family reunion is cut short when they find themselves trapped and hunted by Samuel Register, also known as the Zookeeper! Can the heroes escape Zookeeper's most dangerous game?