When the sole witness against the son of a powerful mob boss goes missing in the woods, it's up to Mark, Rex and Jesse to track him down. The mob boss has already hired an assassin to find the witness.

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Michael Bublé, Niall Horan, Reba McEntire and Snoop Dogg all vie to discover the next singing phenomenon; in a new twist, host Carson Daly has the power to pick one artist who doesn't receive a chair turn to come back and try again later.

As Wolf deals with a personal crisis that brings up dark corners from his past, the interns assist an MMA fighter exhibiting strange symptoms. Meanwhile, Pierce is visited by Bitsy, a gossipy Upper West Side housewife, who gives her some shocking intel about a nearby influential surgeon.

Leela's parents adopt Dr. Zoidberg.

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Stephen welcomes actress Scarlett Johansson and Senator Mark Kelly.

When Junior and Babbit turn up the heat, the brothers respond in kind. Roxie appeals to Wes to make changes at the restaurant.

Abaddon struggles to control his instincts, Katherine bumps into a business rival, and Nathan, Ben and Esther investigate a possible werewolf.

In a medical crisis, Asia is the only one who can help. Victoria welcomes a distraction as she sends out mayday signals. A call grows in urgency.

The bakers return to school, starting off with the classic canteen favourite, flapjacks, before being tested with a fondly remembered school cake technical, with a catch. For their final exam, they have to produce a spectacular school fete showstopper, full of nostalgic treats. Mr Hollywood and Ms Leith judge their efforts, before deciding which of the students to expel.

Schuey and Agnes cause uproar when they rebel against Stella's new rules. New teacher Darius Donovan arrives and shakes up the staffroom, while Jack Rimmer returns to school.

Ashton takes drastic measures when Donte is plunged into crippling debt. Nicky saves the day when Debs gets out of her depth, while Jack attempts to help Libby settle back in.

When a police team-building trip takes a sinister turn Sister Boniface must discover which of their rivals is a murderer.

Harold and Edith risk their lives to bargain with William but get a guarded reception. Harold's siblings face hardships trying to secure their family's future.