When Denby Desmond responds to a comic book ad that claims, "You can be hero," his summer takes a bizarre turn. After Denby puts on the strange rat costume that's delivered to him only minutes later, he finds himself with unbelievable super powers and an overwhelming need to do good.
Tod Watson, an eight year old lad, answers an ad in a comic book, and receives a hero's outfit. Tod's life for thirty-seven days will never be the same, and neither will the small town of South Fork. Disguised as Ratman, Tod saves his best friend, and performs other feats of heroism.