One of the new guest stars on ABC's Castle will be met with "clear and present danger" in the upcoming seventh season of the show.

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Chad Michael Collins, most recently seen as Dr. Frankenstein's deceased brother on ABC's Once Upon a Time, has been cast in the new season of Castle, the actor confirmed on Facebook this week. Collins will be guest starring in the third episode of the upcoming season, which is titled Clear & Present Danger.

Collins is set to play Tom Talmadge, described as "a tech start-up entrepreneur who was assaulted under mysterious circumstances," according to Give Me My Remote.

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The actor gushed about his experience on the set of Castle this week via Twitter.

"Excited to shoot @Castle_ABC tomorrow, where @NathanFillion and @Stana_Katic will be giving me the business," Collins tweeted on Wednesday. "Hopefully they'll be gentle."

After filming, he tweeted:

"Had a blast shooting @Castle_ABC today. Thx for being hilarious scene padnahs @NathanFillion and @Stana_Katic. I shall do succubi research.."

Before Collins' episode, Castle will be concerning itself with the fiery car wreck that Castle (Nathan Fillion) got into in the Season 6 finale. Both Castle and Beckett (Stana Katic) were set to be married on the same day the wreck occurred.

Since this ruined Beckett's big day, it seems clear that she will be getting to the bottom of how the wreck happened.

Castle Season 7 is set to premiere on Monday, Sept. 29 at 10 p.m. on ABC.

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Castle, Television, ABC