Carrie enjoys being single; Miranda fakes ecstasy; Samantha dates a club owner.

Sydney goes under cover in a mental hospital to get information from a man who doesn't know he is programmed to be an assassin.

Sydney helps Shepard (John Hannah) escape from the asylum; Sloane learns that moles may have infiltrated SD-6.

Benson and Stabler have a suspect (Alfred Molina) but not enough evidence when a serial rapist preys on illegal immigrant women, and Tracy Kibre (Bebe Neuwirth) is brought in to work on the case.

Marshall's life is put on the line after his mission with Sydney. Meanwhile, Jack becomes the main suspect of Emily's disappearance.

Christian and Sean struggle to rebuild their practice as they settle into their new location; a Hollywood publicist offers to help build Christian and Sean's images through the media.

Sean and Christian learn about the glamorous side of fame; Julia visits Sean, Christian and Liz in Los Angeles with a surprise announcement.

Brian Finch's life takes an extraordinary turn when he uses a mysterious drug, NZT, that allows him to access his full brain capacity. However, when an NZT-related murder lands Brian on the FBI's radar, he uses the drug in an attempt to stay ahead of the authorities long enough to clear his name. Academy Award nominee Bradley Cooper executive produces and recurs as Sen. Edward Morra.

Sean tries to regain his youth through his relationship with Eden; a traumatic event causes Julia to question her relationship with Olivia; Kimber makes a decision that devastates Matt.

Sydney tells Jack about a dream involving Will. Jack advises her to contact Will, who is in the witness protection program.

Christian falls back into old habits; Sean hires a new receptionist to get back at Christian; Dawn requires more plastic surgery following another unfortunate incident.

Sen. Morra (Bradley Cooper) demands a high price for Brian's next inoculation to combat the side effects of NZT.

Sean takes on an agent, expanding his role on "Hearts 'n Scalpels"; suspicious Christian questions Gina's motives for moving to Los Angeles.

Sean's hiring of a new anesthesiologist leads to trouble; Kimber goes to extreme measures to make sure Jenna has a good life.

In the milestone 100th episode of the award-winning spy drama, Sydney's maternity leave is cut short when she learns that Will (Bradley Cooper, "Failure to Launch", "Wedding Crashers",) has been abducted by her nemesis, Anna Espinosa (Gina Torres). Meanwhile, Sloane finds himself one step closer to obtaining the cure for daughter Nadia.

Jack tries to resume a sense of normalcy after his brutal attack, but he finds that the injury may keep him from returning to his old life.

Bobby's heartbreak turns to anger as he seeks revenge on Jack, who he believes is responsible for his breakup with Dex.

Grace promises to be on her best behavior when she and Jack go to Missy's house for dinner, but she loses her cool when the minister (Ed Begley Jr.) attacks her ideals; Bobby intentionally loses at chess games with Peter to spend more time with him.

Jack surprises Grace and Tom in a compromising situation and tells Grace he disapproves of her romance; Bobby convinces Grace to let him make an eye-opening overnight hunting trip with Peter.

Directing a blockbuster movie takes skill, stamina and vision; directors Blitz Bazawule, Bradley Cooper, Ava DuVernay, Greta Gerwig, Todd Haynes and Michael Mann share secrets of the art of moviemaking.