Sergio Enrique

The guys kick Sheldon off the team for the Physics Bowl and enlist his nemesis Leslie Winkle (recurring guest star Sara Gilbert) to take his place.

An anonymous source contacts Charlie and provides advance details on an imminent story of national importance. When news breaks that the President will be making a televised speech that night, the 2.0 staff cuts short its one-year (and one week) anniversary party, and rushes back to the newsroom amidst a flurry of speculation as to what exactly happened.

With Mrs. McCluskey's house completely destroyed, Lynette faces the possibility that her family and Ida Greenberg may not have survived; Katherine finds out that someone knows the truth about her mysterious past.

Kate is furiously working hard to shed her unwanted pounds as she continues to struggle with impatience and discouragement. She receives support from her new boyfriend, Toby, as he helps her let loose and enjoy herself. Beth begins to question the motives of Randall's biological father, William, and takes action in getting answers on his activities. Randall has a lot more on his mind with the new life changing addition of having his biological father in his life. Marriage and raising three 8 year old children is beginning to take its toll on Rebecca and Jack (Milo Ventimiglia) as they start to feel distant from one another. Kevin faces the aftermath of quitting his job as he deals with his agent, Lanie (Katey Sagal), and has to figure out how to move forward.

While the NCIS team investigates the cause of a hit and run accident that resulted in the death of a Petty Officer, Gibbs searches for a way to clear a Navy Hospital Corpsman, who has served two medical tours in Afghanistan, after she's indicted for illegally providing medical aid to the victims of the crash, even though the surviving victims swear by her life-saving techniques.