Max and Caroline have different ideas on how to handle their new pre-approved credit card.

The Jeffersonian team investigates the death of a woman whose body was found mutilated and discarded in a city garbage can. Meanwhile, Booth invites Sweets to stay with Brennan and him while Sweets searches for a new apartment.

When a body is found at a sci-fi convention, Castle and Beckett are warped into the heart of fandom -- a world of egotistic celebrities, diehard costumed fans and enough drama for two galaxies.

From "The Big Bang Theory," actor Simon Helberg; actor/comic Ricky Gervais; musical guest Ty Segall.

Colbert Super PAC inspires Mitt Romney, Sasha Issenberg talks data-driven politics, Joe Scarborough doubts liberal math models, and Nate Silver reviews election statistics.

Actor Jack Black and his musical partner Kyle Gass; actress Sarah Shahi; musical performance by Tenacious D.

Artists from Adam and Blake's teams sing for their shot at advancing.