You're proposing?!? Watch Beckett start to answer Castle's question in this sneak peek at the Castle Season 6 premiere.
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You've been waiting for the answer for years. And you'll finally get it when Castle Season 6 premieres on September 23.
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Castle and Beckett get into it in this scene from the Castle Season 5 finale. They argue over the latter's new job opportunity.
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No way Beckett leaves for DC on the Castle Season 5 finale, right? Watch the official ABC promo now.
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Beckett totally pranks Castle in this awesome clip from "The Human Factor." Watch now!
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The machines are alive! So Castle theorizes in this clip from "The Human Factor."
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Beckett receives a job offer on this episode of Castle. Will she take it? Watch the official promo now.
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Castle and Beckett debate the latter's feelings for the former the first time they met in this great clip. It's from the episode "Still."
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Castle Quotes

Sometimes the hardest things in life are the things most worth doing.

Castle

The moment we met my life became extraordinary. You taught me more about myself than I knew there was to learn. You are the joy in my heart. You are the last person I want to see every night before I close my eyes. I love you Katherine Beckett and the mystery of you is the one I want to spend the rest of my life exploring. I promise to love you, to be your friend and your partner in crime and life till death do us part and for the time of our lives.

Rick Castle