Nathan Fillion and Stana Katic Nathan Fillion and Stana Katic

"So, it wasn't a dream!" Richard Castle says early on during Monday's Season 5 premiere of ABC's Castle.

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Exclusive Castle video: Check out the Season 4 blooper reel!

Castle Season 5 promo: Best night of their lives or biggest mistake?

Exclusive: Castle books Supernatural alum for guest spot