The ‘Con is on next Monday at 10/9c when Castle sends Rick and Kate into the belly of the beast that is sci-fi fandom — and we’ve got an exclusive first look at one of the geektacular hour’s most pivotal scenes.

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The episode, titled “The Final Frontier” and helmed by Star Trek vet Jonathan Frakes, finds the sorta-domestic partners in crime investigating a murder at a Comic-Con-esque convention.

In the following clip, they grill a tech whiz (played by Star Trek: Deep Space Nine‘s Armin Shimerman) who manufactures authentic (maybe a little too authentic?) props for elaborate superhero costumes.

Press PLAY below and then hit the comments with an answer to this question: Is this shaping up to be the best episode of Castle ever or what?