At the Las Vegas callback auditions, 115 dancers compete. Every day the dancers learn new routines from different choreographers. After performing their routines they are scored by the panel of judges. The judges each have a scale of 0-3 points for each contestant.

Contestants that score well are put through to the next round and the others are sent home. Those dancers that remain borderline after the results are asked to "dance for their life" - this means they have to perform a solo for the judges. After the solo, the judges make a decision to cut them or not.

Alton's trying to sell a house, but the realtor insists the delectable smell of baked goods can help make the sale, so it's off to the oven for Alton.

On Mac's birthday, she is faced with the fact that there are American hostages being held in Turkey by a militant Kurdish group. Meanwhile, she also has to interview new candidates to be her Vice President and Dickie tries to convince her of the type of person she needs to choose because her choice will affect her re-election campaign.

Lauren has to face her boss after the party. Meanwhile, Heidi doesn't take school seriously and makes different plans for her future.

TONIGHT: Actress Bonnie Hunt from the movie Cars. Plus, Lewis Black reports in Back in Black!

Tonight Stephen welcomes Cornell University scientist and author of Roving Mars Steven Squyres.

Profile of autistic professor Dr Temple Grandin, who is famous for her ability to talk to animals and understand their behaviour in ways no one else can. She believes her remarkable skill developed as a result of her brain disorder and claims she experiences life in the same ways as the animals themselves.