The curious case of kryptonite
You don’t have to know that much about Superman to know that kryptonite is his weakness. What’s interesting is the way in which the evil stuff was first introduced. While it appeared in the Superman comics as early as 1949, kryptonite first became a thing when the voice actor who played the superhero in the radio show The Adventures of Superman needed a vacation. According to Nerdist, it was in 1943 that the show debuted kryptonite, a deadly mineral, using a stand-in who simply had to moan in pain until the original actor returned from his trip.