When Rachel makes a promise to Sarah, it comes with a hefty price. Meanwhile, Helena and Gracie work with the Hendrixes, and Donnie takes Kellerman to task. Over at Castor, Coady and Benchman scheme to track down the Castor Original, and Rudy descend... (more)s on DYAD for a much needed asset.
Josh Vokey, Justin Chatwin, Ksenia Solo, Kyra Harper, Rosemary Dunsmore, Tom McCamus