The Scarecrow invents a fear chemical that is activated by adrenaline. Then, he uses it to affect the outcome of athletic events. Whenever a single person becomes agitated, the fear chemical kicks in, turning his excitement to fear. The Scarecrow bets against the sports stars' teams as part of his criminal scheme to scare up some quick cash, and Batman and Robin must foil his plot.

Detective Bullock is arrested for kidnapping. Batman, who dislikes Bullock but nevertheless believes him to be a good man, investigates, and discovers the identity of the real criminal: Killer Croc, who harbors a vendetta against Bullock for capturing him once. Can he clear Bullock's name before it is too late?