The Invisible Nerd!

The Invisible Nerd! is a story that appears in.

Plot
Bart and Milhouse rummage through Professor Frink's garbage. When a chemical falls on Milhouse, he loses his glasses and thinks he has been blinded. Bart tricks him into thinking he is also invisible. Bart persuades Milhouse to take advantage of his "invisibility" while at school, the Android's Dungeon, at home and at the Kwik-E-Mart. Milhouse still thinks he is invisible when he is approached by Jimbo, Dolph and Kearney. Bart has an attack of conscience and chases the bullies off with mind games. He returns Milhouse's glasses, telling him he has turned visible again, though both boys are shocked when an invisible Professor Frink talks to them.