Batman (1966)

S02E35 The Contaminated Cowl

The Mad Hatter has broken free from incarceration and is determined to steal Batman's cowl for his hat collection. Disguised as the Three-tailed Pasha of Panchagorum, he infiltrates Gotham City's annual headdress ball and pilfers a sizable ruby from columnist Hattie Hatfield's elaborate headpiece. After a quick escape, he maliciously sprays Batman's cowl with a radioactive solution, turning it pink. Following Batman to the Atomic Energy Laboratory, the Hatter plots to snatch the cowl while it’s removed for decontamination.