Burgers are universally beloved because they're the food of the people. But few can deny the appeal of secret, off-menu burgers—a concept that was popularized by the GOAT fast-food chain, In-N-Out.

With the obsessive demand for Animal-style burgers, other fast-food chains like Shake Shack and Five Guys have taken note, creating more competition in the field. So which fast-food, off-menu burger reigns supreme?

To get some answers, Alvin is linking up with a surprise guest: Seth Rogen. Rogen and Alvin's friendship dates back to when Alvin first opened his food truck, Eggslut, in Los Angeles, where he'd often find Seth in line waiting to order a bacon-egg-and-cheese sandwich. 

The stars are aligned, and Seth and Alvin are together again to crown a fast-food, secret burger champ.