House is injured in a motorcycle accident in New York and finds himself in bed next to a patient suffering from complete paralysis. As House transfers the patient to Princeton to determine what's wrong with him, Wilson tries to find out why House was in New York.

Casey returns with secret plans to move out of the ZBZ house; a new freshman is highly desired as a pledge; Rusty tries to balance studying with life in the Kappa Tau house.

Serena throws Jenny a sixteenth birthday party, but things spin out of control when Poppy Lifton turns the party into the social event of the season. Vanessa agrees to help Chuck in a plan concerning Blair and Nate. Meanwhile, Rufus searches for a way to cover Dan's tuition when he learns he will not receive financial aid to go to Yale.

A female agent is sent to evaluate Sarah's performance, when Chuck's feelings for her are revealed. Meanwhile, Morgan, Jeff and Lester are trying to get invited to Captain Awesome's bachelor party.

Penny feels threatened when another sexy woman moves into the apartment building.

Emma somehow manages to fall into the role of substitute teacher, and asks Wanda and Karen to speak at Career Day; Lacey comes up with a scheme to make The Ruby a friendlier place to be for the patrons on their birthdays; Brent and Hank stumble upon a 30-year old treat at Corner Gas.

Clips include a skier's fall; giant explosions aboard an oil tanker fire; a plane crash lands on an aircraft carrier; an explosion injures firefighters.

Week four's performances include the Argentine tango and the Lindy Hop.

When Barney learns Ted has a list of things he thinks the gang is too old to do, he sets out to do every task within 24 hours in order to prove Ted wrong.

Tony leads a group of FBI agents into Starkwood with the help of Hodges's aide, but finds that his intel might not be as accurate as he thought. Olivia moves her way deeper into her mother's inner circle when she is appointment as acting Chief of Staff, and chooses Aaron Pierce to be her personal bodyguard. Jack learns harsh news about his future after being examined by CDC.

The heroes try to mend their broken relationships as Nathan and Claire seek refuge in Mexico and Peter and Angela hide out in a church. Danko's bid to wipe out the superpowered population intensifies as he unites with a surprising new ally.

Julian makes an alarming proposition to Brook. Peyton prepares herself for the future while Lucas revisits an important place with Nathan and Jamie. Sam and Jack demand Haley be reinstated back to work.

Charlie joins Alan, Gordon, Herb and his next door neighbor, Jerome (Academy Award nominee Michael Clarke Duncan) in a night of alcohol-fueled sexual reminiscences after Chelsea finds nude pictures of another woman on his phone.

Doug dates a bartender and Clay's dad is back on the dating scene. Grace isn't sure how Clay will take the news. The death of a jogger give the team some clues about his life. A classmate from high school visits Leon.

Clips include a crash of a motorcycle stunt; a racing boat disintegrates; the documentation of an F3 tornado; a vintage dragster slams into a wall.

A greenhorn finds himself struggling just to keep his job. A pilot is trapped when fog rolls in. Dustin is facing a life-and-death situation. And Jimmy encounters a problem which may threaten his business.

Jeff and Audrey don't want to go to Jennifer and Adam's party because the party they are going to has a special guest. Timmy has to keep an eye on Russell.

An unknown attacker causes Wolfe to cover up evidence of a crime to save a kidnapped child.

Allison has a dream about a game show that can detect lies, and upon waking up she hears a buzzer in her head whenever someone tells her a lie. Allison's new talent is put to good use during a murder investigation.

The investigation behind a body found wrapped in a rug on the sidewalk leads Castle and Beckett deep inside the world of New York City politics. The partners discover a world of expensive escorts, arrogant tycoons, corrupt investigators, and the effects of betrayal.

CNN's Jack Cafferty

Tonight Stephen welcomes the chief astronomer at the Joel N. Bloom Observatory, Derrick Pitts.

Going back to the time when Ichigo, Uryu, and Chad left the real world for Hueco Mundo with Kisuke's help, the main focus is now directed to the events that took place in Karakura town during the previous arc. Kisuke feels that Karakura town needs protection against hollows now that Ichigo left. In one night, he came up with the idea to create a fun way to protect the town, which was to force Kon into a team of hollow fighting super heroes called "Soul Burial Detective, Karakura Riser". Once Kon gets used to his new hero suit, he meets the rest of the team which includes Don Kanonji, Tatsuki, Chizuru, Keigo, and Ururu. After a successful fight with hollows, the team encounters a woman who appears to be an arrancar.

When the ward is hit by a chemical contamination Jac and Joseph find themselves stuck in theatre mid-operation. They end up talking about how they feel when they are worried that they will not get out alive. Connie wonders what is going on when Annalese disappears from a major operation.

Ever since he was at school, actor and comedian Alan Davies has hated maths. And like many people, he is not much good at it either. But with the help of top mathematician Professor Marcus du Sautoy, Alan is going to embark on a maths odyssey. Together they visit the fourth dimension, cross the universe and explore the concept of infinity. But did his abilities peak 25 years ago when he got his grade C O-Level? Or will Alan be able to master the most complex maths concept there is?

Jamie beats Joe up after he discovers that he has been hitting Mandy. Mimi decides to take the blame for the attack to save her son from being sent back to prison. Paddy's secret comes out.