Annie, Auggie and Calder go on an unauthorized mission to Hong Kong in the hope of apprehending Henry's courier. Meanwhile, Joan and Arthur reveal a traitor who's been hiding in plain sight.

The darkest of days are about to begin. The Doctor has always been a man of secrets - and now they can be told!

For one night only, Professor Brian Cox takes an audience of celebrity guests, including Charles Dance and Rufus Hound, and members of the public on a journey into the wonderful universe of the Doctor, from the lecture hall of the Royal Institution of Great Britain. Drawing on the latest theories as well as 200 years of scientific discoveries and the genius of Einstein, Brian tries to answer the classic questions raised by the Doctor - can you really travel in time? Does extra-terrestrial life exist in our galaxy? And how do you build something as fantastical as the TARDIS?

The Eleventh Doctor, played by Matt Smith, arrived on screen lively, funny but wise. Join the Doctors Revisited as we examine the human side of this Doctor and take a look at how his 950 years have affected him. Featuring interviews with Matt Smith and Jenna Coleman, we take a look at the Doctor's new companion Clara Oswald and catch a glimpse of the Doctor's very frightening foe The Silence.

When a beautiful young woman is murdered, Holmes and Watson investigate her ties to a billionaire CEO. Mycroft makes a case for Sherlock to move back to London.

The glee club learns the dance of the hour: twerking. Meanwhile, Marley discovers Jake's relationship with Bree, and Rachel tries to convince Kurt they both should get tattoos.

When an unexpected malpractice suit turns Callie's world upside down, her supportive father arrives and shares an interesting secret with her. Meanwhile, through flashbacks, we learn some surprising details about Callie and Arizona's marriage.

From "Homeland", actress Claire Danes; from "Nebraska", actor Will Forte; musical guests Metric.

Zeek gives Sarah advice; unsettling news from Victor's school creates tension in Julia's home; the media discovers skeletons in Kristina's closet; Amber makes a decision that shakes things up with Ryan.

Leslie throws Ben a birthday bash but is forced to leave early for an emergency late-night filibuster. Tom tries to make some memories with his new girlfriend, Ron and Donna go hunting. April reconnects with Andy.

Leslie prepares a haunted house on the day of the recall vote. Tom fears the end of Rent-A-Swag and persuades Ron to help save his business.

When Olivia, who is an ex-lover of Francis’, arrives at the castle, she brings the dangers of the woods with her. Mary seeks comfort in Bash. Bash is threatened by heretics for interfering with a sacred blood rite. Meanwhile, Aylee is forced to spy on Mary when Queen Catherine blackmails her.

Mellie is still trying to recover from the public backlash of the last year so she decides to do a hard-hitting news interview. Meanwhile, as Cyrus continues to plot against Sally Langston, we learn how Fitz, Mellie and Cyrus became a team. Back at OPA, Huck continues to push Quinn away, but Quinn's bloodlust could get her into some dangerous situations.

Leonard tries to keep Sheldon from overreacting when a past mistake comes to light, but Sheldon punishes Leonard by making him "walk a mile in his shoes." Meanwhile, Penny confronts Raj's ex-girlfriend, Lucy (guest star Kate Micucci).

Stephen calls for aid to the Philippines, The Today Show airs live prostate exams, and Alexis Ohanian discusses online democracy and his book, "Without Their Permission".

From "The Hunger Games: Catching Fire", actor Donald Sutherland; from "Ass Backwards", co-author and actress Casey Wilson.

While Elena and Damon try to explain Amara’s situation to Stefan, Dr. Wes gives Katherine some deeply disturbing news. Nadia shows up at Caroline’s dorm room, searching for Katherine. After a surprising conversation with Amara, Jeremy and Bonnie share a glimmer of hope. Silas fails to keep a promise, causing Damon to turn to Tessa for help with his new plan, and Stefan makes a heartbreaking confession to Damon and Elena.

Neal goes undercover as a butler to help expose an imposter hoping to cash in on a wealthy family's fortune.