A murder investigation launches Castle into what seems to be an alternate universe where he's never met Kate Beckett. Castle has to convince Beckett, Esposito and Ryan -- now complete strangers -- to let him participate in their investigation so he c... (more)an find his way back to his own world. This inspires Castle & Beckett to finally take a trip to the altar.

Byron Marc Newsome, Clyde Yasuhara, Daniella Alonso, David Francis Harris, Jacqueline MacInnes Wood, Jeffrey Nordling, Julian Scott Urena, Kate Huffman, Kendall Clement, Michael Scovotti, Paul Darrigo, Reena Dutt, Scott Anthony Leet, Scott Paulin