Kate Beckett (Stana Katic) spots Richard Castle (Nathan Fillion) in the season six premiere of ABC's drama. The episode "Valkyrie " is set to air on Monday, September 23 at 10/9C.
The "House" alum drops by the ABC procedural for a three-episode stint, revealing to THR that her mother -- a "Castle" fan -- was a key reason she signed on. Read More
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