The Simpsons: 10 Guest Stars That Must Appear Before The End

10. Morgan Freeman

Morgan Freeman's voice is iconic; instantly recognizable, and may even be the voice of your inner monologue.

Point being, Freeman has one of the most distinctive set of pipes on the planet, and he's one of Hollywood's most beloved actors, starring in classics like The Shawshank Redemption, Unforgiven, Seven, and Million Dollar Baby.

At age 80, Freeman has shown no signs of slowing down just yet. In fact, he has a number of titles in production for 2018 including another Olympus has Fallen sequel. There's still time to get the legend on the show, adding his unmistakable voice to the chorus that is Springfield.