This past Monday, ABC pulled a last-minute switcheroo and aired the premiere of Scandal instead of replaying Castle Season 4, Episode 9: "Kill Shot."

While the majority of you were so tiffed that you refused to watch the new series, some of you tuned in and were pleasantly surprised.

Whatever your sentiments about Scandal (we're kind of loving it, by the way), the intriguing drama has returned to its regularly scheduled time slot on Thursday nights at 10 p.m. ET, which means our show is back next Monday with an all-new episode.

So, what can we expect from Castle Season 4, Episode 21: "Headhunters," aside from a Firefly reunion, of course?

According to the official show synopsis, tension between Castle and Beckett hits an all-time high, causing Castle to seek the company of a new detective — Ethan Slaughter from the city's rough and tough gang unit, played by Adam Baldwin. But will Adam be able to keep Castle out of harm's way?

For all the latest news on "Headhunters," click here.

Original Air Date: Castle Season 4, Episode 21: "Headhunters" airs on Monday, April 16, 2012 at 10 p.m. ET on ABC.

Credit: YouTube Photo: Castle Promo for Season 4, Episode 21, "Headhunters": Rick Gets a New Partner!

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