Nate, Teddy, and Fiona are preparing for one of the biggest days of the year--the opening of the annual Kanigher Falls Comic Convention. Meanwhile, Nate and Ultraviolet hear that someone's been auditioning supervillians for a big job. The challenge is to pull off the world's biggest heist. The first day of the convention arrives, and Nate and his friends discover that a group of supervillians have formed an alliance in an attempt to steal a valuable comic book! Who will swoop in to save the day?