The Simpsons: 15 Huge Guest Stars & Cameos You Forgot
1. Neil Patrick Harris
Are you ready to feel old?
Today, Neil Patrick Harris is arguably best known for his portrayal of ladies' man Barney Stinson in How I Met Your Mother, he was Count Olaf in Netflix's A Series of Unfortunate Events reboot, and has hosted multiple Tony and Academy Award shows.
However, he first grew to fame as a child, starring as Doogie Howser from 1989 to 1993. Similarly to Frankie Muniz, The Simpsons was able to capitalise on this popularity and bring the actor in for 'Bart the Murderer' in 1991.
When Bart was accused of running the Springfield mob and murdering Principal Skinner, it was all over the news and was even the subject of a movie adaptation. 'Blood on the Blackboard' featured Richard Chamberlain as Skinner, Joe Mantegna as Fat Tony, and Neil Patrick Harris as Bart.
Yes, The Simpsons has been on the air for that long that Barney Stinson once lent his voice to a ten year old on screen Bart Simpson that killed his Principal in cold blood.