The coast-to-coast auditions continue as the judges search for the next million-dollar act.

An exploration of the effect of music on the brain via four case studies from neurologist Oliver Sacks book "Musicopia" and the MRI visualizations from Sacks' own brain as classical music is played, including Bach's "Mass in B Minor". Study subjects include a man with Tourettes syndrome who has found relief while playing the drums; an autistic savant who is simply dazzling on the piano; a woman who suffers the inability to process music, known as amusia; and a surgeon whose life changed after being struck by lightning.

Late into the season, each skipper faces his own personal brand of hell. Frozen crab, frozen gear, and a frozen harbor chill the hearts of even the most callous fishermen. On the Cornelia Marie, Skipper Phil gambles on the theory that air bubbles on the water means crabs are farting down below. On the Time Bandit, Captain Andy enters St. Paul harbor-now frozen enough to walk across. Five pack-a-day smoker Sig Hansen tries his hand at quitting the habit. When a huge storm kicks up he takes his stress out on his crew. Aboard the Wizard, Captain Keith demands an answer from his greenhorn: "Are you in or out?" It's a season where very crab has been paid for in headaches-but the rising seas and oncoming ice-pack could make things worse.

When Veronica, Linda, and Ted end up having to share offices, tensions grow between them. Meanwhile, Lem finds himself in close proximity to a new attractive co-worker and Phil works to find a solution to an acid leak.

Christina tries to save a mom and her son after being in a car accident but can't find what caused the paralysis.

After dealing with a particularly horrific accident on the job, Tommy questions his feelings in a dream sequence with his dead father, brother and son, and Jimmy Keefe. Meanwhile, Sean has an unwanted visitor at the hospital; and Lou has a very-much-wanted visitor to his apartment.

A suicide note causes Grace to question a member of an alcoholic group.

A weekend with Ben turns into a busman's holiday when William must deal with two alcoholics.

Author Mike Kim talks about his harrowing ordeal in North Korea with Jon and in his new book Escaping North Korea: Defiance and Hope in the World's Most Repressive Country '.

Tonight Stephen welcomes historian and author of 'What the Heck Are You Up To, Mr. President?': Jimmy Carter, America's 'Malaise,' and the Speech that Should Have Changed the Country, Kevin Mattson.

HMAS Kanimbla Challenge - Poh, Justine and Tom returned to the competition