Start the morning off this Sunday with mouthwatering new episodes of Guy's Big Bite and Sandwich King. Guy makes a delicious meal of turkey lasagna packed with cheesy goodness and Jeff learns the secrets to making classic Vietnamese sandwiches. In the evening tune in for a special birthday treat on Cupcake Wars as the competitors battle to win the approval of guest judge and birthday girl Tiffani Thiessen. Afterward, in the fourth round of Chopped All-Stars, celebrities Johnny Weir, Joey Fatone, Laila Ali and Judy Gold descend upon the Chopped kitchen to compete for the first time. Last, Robert Irvine must contend with some creepy crawlers in his next restaurant redo.

Guy loves Italian food, so in this episode he'll be making his version of lasagna, a White Turkey Lasagna featuring layers of pasta, ricotta, zucchini, turkey sausage, mushrooms and mozzarella. He's also making Crispy Zucchini Chips With Parmesan and Roasted Garlic Aioli for dipping them into.

Jeff visits Saigon Sisters to discover the secrets behind the Vietnamese classic banh mi, and recreates the same sweet and salty flavors in his own Vietnamese sub. He also makes a veggie-packed Shrimp Spring Roll and completes the Asian-themed menu with Vietnamese Chicken Soup.

Four bakers return for a second chance in Cupcake Wars. This time they will be battling for the chance to serve cupcakes at a birthday party for the star of White Collar, Beverly Hills, 90210 and Saved by the Bell — actress and guest judge, Tiffani Thiessen.

Four celebrities with varying backgrounds but a shared love of food and cooking are competing in the Chopped kitchen for the first time ( Watch a sneak peek above). The appetizer round throws them vanilla cupcakes, which they must use to create a savory dish. Then in the entree round, the three remaining celebrities must use gelatin cups in a creative way with the other ingredients, which include a protein and a leafy green. The dessert round finds the two remaining celebs juggling circus peanuts and curry powder from the basket ingredients.

Gus and Evi, the owners of Smitty's Restaurant in Clearwater, Fla., have more than just one problem, they have hundreds — the kind that only an exterminator can remedy. Robert is in for a challenge, as much of his budget and time must be used to fix the pesky problem before his team can delve into all the other pieces of the restaurant revamp. It will truly be a race to the finish in this episode.