Summary: Chief Executive Phil Couchman heads back to the frontline to work alongside his staff. Terrified of losing even a single customer to the competition, Phil aims to find out if workers are delivering the top notch service he expects. In the three years since Phil became boss, he's seen DHL's turnover reach a massive 800 million pounds. But rapid expansion brings its own problems. When the CEO goes undercover he discovers a stretched workforce and customer service staff who are tied up in red tape. Phil is moved by a courier who supports his family in Brazil but has no job security, another whose job is stretching his body to breaking point, and finally by couriers being paid unfairly. Phil is forced to consider whether DHL have more to worry about than just their customers.

Summary: After years in the boardroom, Geoff Zeidler of Securitas goes undercover, to be blown away by the sacrifices his security officers make and the violence and racial abuse they encounter through just doing their job. Private security company boss Geoff Zeidler of Securitas spearheaded a risky takeover of two rival firms just as the worldwide recession took hold. Securitas's global profits are down by a staggering £65 million and he's now responsible for 12,000 officers that the company didn't originally recruit. So Geoff's gone undercover to find out if his new officers are of the high caliber the customers expect. Geoff is shocked by how much pressure his new staff are under, and amazed by the personal sacrifices the security officers make. After witnessing the violence his officers tackle and the racial abuse they endure, Geoff's forced to consider whether Securitas has more to worry about than just the bottom line.

Summary: Company director Ray Pope steps out from his cosy office and into very unfamiliar territory by going undercover on the shopfloor of multi-million pound car giant Hyundai. Having tripled car sales in only four years, Ray worries that the business might be creaking under the strain. After years behind a desk, he's finally getting his hands dirty, but unearths sales staff struggling to perform, mechanics so demoralised that they're leaving the company, and valets frustrated at unachievable targets. And when the boss heads to the company's largest operation, Tilbury docks, where they import 2500 cars a week, he's shocked to discover that dozens of cars are going missing.

Summary: Eleanor Kelly, Chief Executive of south London's Southwark Council, wants to see how slashed budgets are affecting the borough's services, residents and an often under-appreciated staff. Cuts of nearly 100 million pounds have forced Eleanor to think outside the box. With 300,000 residents demanding round-the-clock services and pressure mounting as a result of an inquest into a tragic fire, the undercover CEO needs to discover if slashed budgets mean Southwark is failing its residents. But after years at the top, she's shocked at what she finds.

Summary: Chief Executive Ian Wakelin goes undercover in Biffa, the waste and recycling company. Biffa has been finding it increasingly difficult to turn muck into brass in these tough economic times. With debts in excess of a billion pounds when he joined, Ian's been wholly focused on restoring the company's flagging fortunes. Determined to maximise profits and pay back the company's remaining debts, he heads to the front line in search of ways to balance the books. After mucking in with his hard-pressed staff, and working in challenging conditions, Ian discovers that some feel they've been overlooked and dumped at the tip. But it's not just hard physical graft, as tears and trauma come to the fore. It's an experience that forces Ian to question whether the company's people should be his main concern and not its numbers.

Summary: Peter Harvey, boss of slot machine company Quicksilver, adopts a dramatic disguise and goes undercover in the hope of working undetected alongside his frontline staff. Hit hard by the smoking ban, the company has seen profits drop by a massive 30% and Peter is desperate to find new ways to attract more customers. Once undercover, the CEO is shocked at what he finds: a young female employee feels vulnerable working at night; a talented engineer with ideas has been told to 'shut up' by management; and venue staff feel so ignored by head office that many want to leave the company. The boss has to confront the reality, that it might not just be the company's dwindling profits he has to worry about but also his underappreciated staff.

Summary: Mike Bloom, President and COO of Family Dollar Stores, one of the largest discount retail companies in the country, faces his fear of heights when learning to operate a forklift that takes him 35 feet into the air. Also, the boss nearly blows his rock 'n' roll disguise when one employee invites him to a jam session

Summary: Travis Boersma, President and Co-Founder of Dutch Bros. Coffee, learns what keeps his high-energy coffee chain brewing when he journeys to El Salvador to work on the coffee plantation from which his company purchases their coffee beans. Also, the boss recruits a colleague to go undercover for him when he fears a familiar face may spill the beans on his mission at the company's headquarters

Summary: Seven previously featured "Bosses" discuss the challenges they had with keeping their identity undercover. Also, they provide updates on some of their memorable employees

Summary: Shane Evans, COO of Massage Heights, one of the largest massage chains in North America, must overcome her aversion to touching people when working as a massage therapist. Also, one store's disregard for company policy rubs Evans the wrong way

Summary: Bruce "Two Dogs" Bozsum, Chairman of Mohegan Sun, goes undercover in the gaming, hotel and entertainment destinations as he prepares to pass the business on to the next Chairman of his Native American Tribal Council. Bozsum learns the high-stakes role of slot attending and nearly runs out of gas as he retrieves cars from the valet

Summary: Joe DiDomizio, president and CEO of Hudson Group, works undercover at his travel retail company.

Summary: Greg Miller, CEO of the Utah Jazz, one of the most recognizable basketball organizations in the NBA, attempts to make halftime history when he works undercover with their infamous Dunk Team. Also, the boss’ team spirit is put to the test when he is asked to become a human basketball hoop as a member of the Interactive Team.

Summary: For the first time on UNDERCOVER BOSS, three previously featured bosses - Amit Kleinberger, CEO of Menchie's; Randy Dewitt, Co-Founder and CEO of Twin Peaks; and Steve Greenbaum, CEO and Co-Founder of PostNet - send an employee undercover for a second look inside their companies

Summary: Jeff Platt, CEO of Sky Zone, the world's first indoor trampoline park, jumps into action as a referee for a children's dodgeball game. On another assignment, the 29-year-old boss - the youngest in the show's history - has trouble hiding his in-depth knowledge of the company when working in community relations