On Monday night, Castle's Nathan Fillion will team up with former Firefly co-star Adam Baldwin for the first time in ten years. Take a look back at one of their most memorable Firefly moments from Episode 9, "Ariel," where Mal confronts Jayne about betraying the ship. and ultimately spares him his life.
Original Air Date: Castle Season 4, Episode 21: "Headhunters" airs on Monday, April 16, 2012 at 10 p.m. ET on ABC.
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