Dennis and Dee's ailing grandfather Pop-Pop is wasting away in the hospital, and they have to decide whether or not to pull the plug. Things get complicated when The Gang learns of Pop-Pop's history as a Nazi, and Mac, Charlie and Frank set off in search of the old man's spoils from the war.

From "Elementary," actress Lucy Liu; actor Rob Corddry; musical guests Daughter.

Dara O Briain and the regulars laugh at another week's events with guests Milton Jones, Katherine Ryan and Josh Widdicombe.

Amy feels threatened by Sheldon's new assistant; Wolowitz starts to feel the pressures of being in space.

Joe Biden debates Paul Ryan, Martian Obama rumors surface, Stephen argues with Stephen over Mitt Romney's conservative credentials, and Chrystia Freeland talks "Plutocrats".

The League prepares for the draft and the arrival of Kevin and Jenny's baby boy. Taco's business dealings with Jerry Jones get the guys invited to the Dallas Cowboys' Training Camp.

Elena awakens on the morning after the accident to find the thing she dreaded most has come true – she died with vampire blood in her system and now must go through the terrible transition to become a vampire…or face certain death. Stefan promises Elena that he and Bonnie will exhaust every possible way out of the situation, but Damon is furious with his brother for letting Elena die in the first place. Bonnie pays a terrible price for her attempt to change Elena’s fate, while Damon takes out his frustration and rage on Matt. In a rare moment of empathy, Rebekah is deeply touched by Stefan and Elena’s devotion to one another. Finally, Pastor Young and the Town Council members begin rounding up the vampires and their supporters, leading to an unexpected tragedy.