Board Thread:The Flash discussions/@comment-27700324-20181031050431/@comment-27700324-20181102162539

Well science fiction is the perfect medium for this problem. In fact it wasn't the first time they worked around it. The Superman radio show was live and the actor playing Superman way back in the day needed a vacation. So in a few episodes, they invented Kryptonite before the comics so the actor could catch a break.