The Simpsons: 15 Celebrity Appearances You Might Have Missed

2. Willem Dafoe

Episode: Mayored To The Mob The Green Goblin was another one-episode wonder, as Willem Dafoe played The Commandant of the military school Bart is sent to after one-too-many pranks. During the Season 8 episode, The Secret War Of Lisa Simpson, the Commandant pushes his students to their limits, and after seeing the discipline involved, Lisa surprisingly volunteers to attend the school, despite it's harsh reputation. Dafoe is one of the main men of the episode, and his style is similar to that of Mark Hammil's bodyguard training sergeant in Mayored To The Mob. It's hard not to love a strict, over-the-top, and slightly unhinged personality. Dafoe nails it.