ABC has released the official synopsis and a whole batch of spoilery images for the conclusion to Castle's two part season 6 opener, "Dreamworld". Beckett races against time to prevent a chemical weapon from killing thousands of people and Rick. Lisa Edelstein guest stars again in this September 30th episode.
- Continuing from the season premiere episode, Beckett races against time to find a stolen toxin capable of killing tens of thousands of people.
- To make matters worse, Castle was exposed, leaving him with less than 24 hours to live.