Janelle Marra

The gang celebrates Halloween at Stuart's comic book store. Meanwhile Leonard and Penny discover a new spark in their relationship when he seduces her with science. And while Howard can't stop talking about space, it takes iconic astronaut BUZZ ALDRIN (guest starring as himself) to get him grounded again.

Mitch and Cam's best gal pal, Sal, makes one of her notorious surprise drop-ins, but this time with big news - she's getting married... tomorrow! Cam and Mitch are the best men, but they can't help but question whether this party girl can really settle down, and they consider an intervention. Meanwhile, Gloria has trust issues with their new nanny, Claire has a rare bonding moment with Haley, and Phil helps Luke with a girl he likes.

J.D. decides to end his relationship with Danni (Tara Reid) because things are moving too fast; Dr. Cox's newfound sensitivity interferes with his ability to inspire fear.

When the remains of a high-stakes gambler are found in an industrial shredder, Booth risks relapsing into his gambling addiction as he and Brennan delve into the world of underground poker. Meanwhile, Hodgins invents a new product related to the lab, and Brennan and Booth find out some exciting news.

The arrival of an altruistic stranger restores J.D.'s faith in humanity and Elliot's faith in men.