When a bomb explodes at a protest rally killing five people, Castle and Beckett realize the key to solving the case is to reconstruct the 47 seconds prior to the explosion. Using video and witness accounts, they uncover the shocking truth about who planted the bomb.

Dave welcomes journalist Rachel Maddow, actor Timothy Olyphant, and musical guests Train.

Mordecai and Rigby enter a video game tournament to win a prototype video game controller called “The Maximum Glove”.

Geraldo Rivera blames the Trayvon Martin shooting on hoodies, Mitt Romney boosts Etch a Sketch sales, and biomedical researcher Dr. David Page defends the Y chromosome.

The coaches fill the last spots on their live round teams after watching their artists perform in the final battles.