Hosted by comedian Aisha Tyler, cast members Ryan Stiles, Wayne Brady and Colin Mochrie, along with guest comedian Heather Ann Campbell put their comedic skills to the test through a series of spontaneous improv games that are prompted only by random ideas supplied by the studio audience. The four performers must use the little information they have and their wild imaginations to depict different characters and an array of scenes, as well as perform songs. After each round of improvisation, Aisha will dole out points to our four performers and declare a winner at the end of every episode.

The Top 12 dancers perform, but two contestants are eliminated. Choreographer Kenny Ortega is the guest judge.

Paige throws Emily a surprise birthday party with even more surprising guests - Jenna and Shana. But it's "A's" actions at the party that lead to the biggest shock of all. Mona's selfless act provides Hanna and her mother with their first bit of good news, but sends Mona down a familiar path. And Ezra gets some distressing news from Maggie regarding her and Malcolm.

Meanwhile, Aria and Jake continue trying to define their confusing relationship. And Emily meets with a world class coach in a last ditch effort to salvage her swimming career.

Twelve more promising performers take the stage at Radio City Music Hall.

Michael is a regular customer at American Jewelry, but the feeling is not mutual among the clerks, as everything he brought in was all but worthless. Ashley doesn't want him back anymore, and Bobby J especially has a hatred toward Michael, but Seth says otherwise, in the event that Michael actually had something of value. However, when Michael offered a car without a title, Seth felt that he was at the end of his rope - until Michael offered a gold chain that might bring in thousands of dollars. Also: speed painter Dave Santia tries to paint Les's portrait in ten minutes in hopes to get money.

Jim and Candace end up in a verbal altercation. Amanda is in recovery while Katheryn might have to prepare for surgery. Wyatt receives another visitor from his past. After reviewing the case, Veronica questions Jim about some of the details. Amanda reveals a shocker to Candace, that she was raped.

A popular high school teacher is killed in a hit and run that is clearly no accident. The squad works to solve the case, but Jane is preoccupied with Lt. Martinez's (guest star Amaury Nolasco) apparent favoritism towards his own drug unit.

As Annie and Auggie's romance heats up, both begin to notice how it strains their working relationship within the CIA. Arthur and Henry almost come to blows.

When a major development in the murder investigation threatens to send Danny away from Green Grove for good, Danny and Kyle find a reason to work together and Jo and Lacey contemplate whether to reveal a major piece of evidence. Lacey's aloof and disapproving father, Samuel, arrives in town for Lacey's sister's birthday party hiding a major secret. Meanwhile, Danny is keeping his own secret from his best friends and realizes it may be time to come clean. And Rico is alerted to a shocking video that has the potential to destroy friendships and reputations.

Three and a half years ago, Mike met his ultimate mystery girl, Kristen, on Facebook. They quickly forged a deep connection, exchanging "I love you's" and carrying on a turbulent on-again-off-again relationship. But despite the fact that the two live only 40 miles apart, Mike's frequent efforts to meet Kristen have been futile. Mike believes that she's afraid of rejection due to a permanent injury from a car accident, but he's convinced Kristen is real and that they could live "happily ever after" together if they could only meet.

Patty Hearst gets kidnapped and brainwashed, Mark Twain flees the city in fear (and finds his unlikely first hit story) and Mary Ellen Pleasant supports abolitionists with her business earnings.

The artists are tasked with assembling tattoo machines from scratch and then using them on the human canvases. Meanwhile, the house turns on Joshua.

Rick and Tasha's relationship reaches a fork in the road; Blue struggles with game performance.

Harvey's defense of Ava hits a roadblock when the interests of her murder trial are at odds with Louis' work to thwart a hostile takeover of Hessington Oil by a rival businessman.

When a heat wave hits the city, Alex is appointed Trauma Team Leader as the hospital is faced with an influx of patients during a blackout. With no back-up power available, Dawn and Charlie must figure out a way to continue their surgery as Joel and Maggie attempt to keep a patient alive while stuck in an elevator.

When Moretti receives a deathbed confession about the hit-and-run murder of a teenager from 1992, she calls on Pierce to determine the ailing man's credibility. The case becomes complicated, however, when the alleged killer's physician, Dr. Hutchins, reveals that his patient's tumor has mysteriously disappeared. Pierce and Moretti must dig deeper into the past to uncover the truth behind a shocking series of apparent homicides.

In the eighth-season opener, the team assembles in the Queen City and kicks off training camp at Paul Brown Stadium.

Dave Attell and Joan Rivers are the guests.

Liam Hemsworth

Steve Martin & Edie Brickell, Leven Rambin

Fiona is shocked to discover that Jackson is investing in the musical.

Daft Punk

President Barack Obama

Diane Kruger, Tony Hale

The contestants from the losing team batle it out in today's elimination challenge.

Billie and Mick's relationship strains under the weight of her infidelity.

This week Adam Hills, Josh Widdicombe and Alex Brooker are joined on the Last Leg couch by English comedian, Micky Flanagan.