World’s Tiniest Superheroes. One of Reed’s experiments goes awry, causing the Fantastic Four to begin shrinking – and they’re not stopping. Within hours, the FF will shrink out of existence unless Reed can reverse the effect. But at miniature size, even a trip to the lab becomes a challenge, even more so when HERBIE’s security systems recognize the action figure sized FF as an infestation of rodents and begins to hunt them down! Even with a helping hand from the Astonishing Ant-Man, the FF are in for a giant-sized challenge.