In the finished episode, it was not Cage who voiced him, of course, but Simpsons regular Hank Azaria.
Grimes (or “Grimey”, as he liked to be called) featured in the season eight episode “Homer’s Enemy”, and remains one of the series’ best-known one-off characters.
A self-made man who arrives at the Springfield nuclear power plant only to be driven mad by Homer Simpson’s fail-upward incompetence, Grimes ends up electrocuting himself to death at the close of the episode.
Josh Weinstein, who served as showrunner on The Simpsons alongside Bill Oakley throughout seasons seven and eight, made the revelation on Twitter when reacting to a tweet which asked: “Is Nicolas Cage a good actor, bad actor, or a good-bad actor?”