A Wall Street situation.

Updated October 14:

Watch a sneak peek of "Y&R's" Billy Miller in his episode of "Castle," which airs tonight, Monday October 14, at 10:00 PM EST on ABC:

Original post August 14:

Billy Miller (Billy Abbott) will be making a guest appearance on an episode of "Castle" entitled 'Number One Fan'. In the episode, Miller will play Mickey Gerhardt, a Wall Street banker who gets mixed up in a hostage situation. The episode is scheduled for October.

Throughout his acting career, Miller has appeared in many commercials for retailers such as JC Penny and Pizza Hut. He also starred in an episode of "CSI: NY" prior to landing the role of Richie Novak on "All My Children." Billy Miller made his first appearance on "The Young and the Restless" as Billy Abbott in September 2008.

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- Candace Young/Kyle Jarmon