"The Contaminated Cowl"
Mad Hatter returns to try and lift Batman's cowl from off his head, and this time he uses hats to commit crimes. First he disguises himself as the Three-tailed Pasha of Panchagorum and lifts the Hatfield Ruby from atop Hatty Hatfield's headdress. He then sprays Batman's cowl with radioactive gas, turning it bright pink. Batman is forced to visit the Gotham City Atomic Energy Lab, where Professor Overbeck offers to decontaminate his cowl. But just as the cowl is removed, Mad Hatter enters again in disguise and swipes it!
Robin eagerly asks Batman if he needs any help when he goes to change into his radioactive suit.
Presenting the slowest method ever used to try and kill Batman: radiation!