Tom Waits to appear on The Simpsons

'We did a lot of research into the 'prepper' phenomenon, where people are convinced that some horrible catastrophe ' like an electromagnetic pulse ' is going to occur, and that people will have to survive without the grid,' he says. So naturally, 'Homer becomes a prepper.'

Jean says that the Grammy-winning Waits won't sing in the episode, titled 'Homer Goes to Prep School,' but fans will recognize the singer's trademark growl 'in a second.'