Seamus Dever The Rookie

The Rookie Season 2, Episode 3: The Bet Sneak Peek and Promo

Nathan Fillion's Castle Co-Star Returns

In tonight's episode of "The Rookie," titled "The Bet," star Nathan Fillion reunites with his former "Castle" co-star, Seamus Dever. Dever played Detective Kevin Ryan in the popular ABC series, which ran for eight seasons.

The Bet Sneak Peek

In the sneak peek below, John Nolan (Fillion) and his fellow officers are called to a crime scene where a police officer has been injured. The officer, played by Dever, is in critical condition and the team must race against time to find the perpetrator.

The Bet Promo

The full promo for "The Bet" reveals more of the episode's plot. Nolan and his team are determined to find the person responsible for the officer's injuries, and they will stop at nothing to bring them to justice.

Don't miss the exciting reunion between Nathan Fillion and Seamus Dever in "The Rookie" tonight on ABC.