Season 4 kicks off as the entire team pitches in to build their biggest cake to date for the L.A. premiere of "Harry Potter and the Order of the Phoenix." Then Duff rents an RV and drives across the country to deliver his creation.

The staff create a cake for an indie music conference and are asked to play against musicians in a charity softball game. Then they concoct a cake shaped like the island of Maui with a dry-ice volcano for a 1-year-old's birthday party.

A 13-year-old wants a Noah's Ark cake with a unicorn left behind for her Bat Mitzvah. Also included: a subway-car cake; an edible replica of an airplane.

A couple who had their engagement cake made by the bakery return for their wedding and groom's cakes, the latter of which will be a Georgetown Hoya mascot. Also included: a French-toast cake with a mouse popping out.

The team presents Roger Moore with a cake for his 80th birthday; the infamous bedroom scene from "The Exorcist" is re-created in cake form. Also: a cake is made entirely out of Girl Scout cookies.

Pro skateboarder Kris Markovich celebrates his birthday at the bakery. Also: Geof creates a cake replica of his former neighbor's Porsche Speedster.

The crew creates a clock-tower cake for the bicentennial celebration of Mount St. Mary's University in Emmitsburg, Md. Also: a coffee-and-cocktail-themed cake for a 21st birthday.

A cake replica of a police cruiser is created for a police captain's retirement party. Also: a life-size likeness of a magnum of wine is made for a prestigious charity dinner; a cake is shaped like a basket of yarn for a 90th-birthday party.

Duff makes a cake for the Baltimore premiere of the Tony-winning musical "Avenue Q." Later, the staff meets the stars and attends the opening-night performance. Also: a guitar cake is made for a bar mitzvah.