CEO Bill Massa of waste water treatment corporation Synagro cleans tanks of 27-year-old sludge.

Scott Sibella, president of the MGM Grand in Las Vegas, poses as a dealer in the casino.

United Van Lines CEO Rich McClure struggles through physically demanding tasks.

Cincinnati Mayor Mark Mallory goes undercover as a municipal employee.

Mack Trucks CEO Denny Slagle works undercover at his company.

Steve Phelps, senior vice president of NASCAR, trains to work with a pit crew; Phelps struggles to keep up while working with the grounds crew preparing for the Daytona 500.

While working under cover on the company's front lines, Frontier Airlines CEO Bryan Bedford cleans a plane's lavatory, contributes to a flight's late departure and discovers how pay cuts are impacting employees' lives.

When DirecTV CEO Mike White goes under cover at the company, he discovers that employees spend their own money for a specific piece of equipment; White accidentally offends a customer.

CEO Kim Schaefer trades her suit for a lifeguard's uniform and struggles to keep up the pace while working in an indoor waterpark that can accommodate nearly 3,000 guests.

Choice Hotels CEO Steve Joyce works under cover within the company.