Secrets from Ducky's past are revealed when he ends up stabbed at the crime scene.

Season 8 begins as Simon, Paula and Randy are back to hear the auditions for this year's show.

Electrifying revelations stir up trouble this week as the teens of West Beverly come clean to each other. Adrianna reveals her secret to Naomi and Navid, who handle the news differently than expected. And when Dixon reveals the depths of his feelings to Silver, their relationship takes a surprising turn. Meanwhile, Tabitha surprises her grandchildren with an unexpected gift, and Annie and Ethan escape from Beverly Hills to the desert beauty of Palm Springs.

This week, the contestants are faced with a temptation that will cause each of them to examine the real reason they've come to the ranch. Then it's off to an outdoor challenge, where they'll race by sea kayak and then on foot to the top of a mountain, hoping to win immunity as well as a coveted phone call home. Later, one contestant pushes trainer Bob Harper to the limit, causing him to freak out during last chance workouts before a surprising weigh-in leads to a heartbreaking elimination.

Dr. Kelso and Dr. Cox have to work together again to get rid of Dr. Maddox, while Carla faces an incompetent intern.

J.D. and Elliot's relationship seems to have been rekindled when they encourage Dr. Kelso to find his true happy place.

Mike counts common terns in Ohio, and seals off an abandoned mine shaft in northern California.

Upon learning that Lily is in prison, Megan rushes to her aid and discovers the reasoning behind her sister's imprisonment. Nonetheless, Will offers to bail Lily out, but Arthur refuses the help as a means to teach his daughter a lesson. Meanwhile, Rose aids Sage in picking out an expensive gift for Luis, but his reaction is nothing like what the twins had anticipated.

The local witch claims to have murdered a high school football star with a spell in revenge for killing her cat, Jane goes to investigate.

A teenager's body is found in the Hudson, triggering a search for her identity, and an undercover assignment for Benson as a madam. But once the girl's name is known, even more mysteries unfold leaving Fin to find the missing piece.

Sean tries to rejoin with his wrecked family, while Liz and Christian start getting closer as his chemotherapy begins to get him sick and Liz takes care of him.

The team searches for a bar owner who goes missing shortly after his statue of St. Theresa cries. Brian's visit takes a new turn.

Leverage Consulting & Associates pose as wedding planners to pull off a heist on behalf of a family who were promised money when one of their own took the fall for a Mafia boss.

Could we be unique in the universe or is there another planet similar to earth somewhere in the cosmos? Is it possible that Alpha Centauri, our nearest star, is home to another earth-like planet? Earth sized planets have been hard to find, but indirect methods are coming on line to give scientists a good survey of how many such bodies may be in the universe. How rare would it be to find life on another earth-like planet?

Actor Daniel Craig talks about his new movie "Defiance".

Leslie decides to open a Lasik business inside Greens & Grains, while Yolanda wants to start a tube top shop at www.yolandastubetopshop.com. Unfortunately, Yolanda's tube top ends up blinding Leslie. Feeling guilty for causing Leslie to be temporarily blinded, Yolanda invites him to stay with her while he recuperates.

Tonight Stephen welcomes the author of The Ascent of Money: A Financial History of the World, Niall Ferguson.

Meliisa put her sister's job on the line as well as her own when she looses control during an adult learning class. Eddie isn't happy when he finds out Rachel ignores his orders and went behind his back.