Episode Title:Fifteen.Episode Description:George appears on a radio quiz show to earn money for his school. Arthur forgets his class report on Michelangelo, which helps his get class a No Homework Day, and after overhearing, Pal and Kate try to help get it to him. They find a postcard with a picture of the Mona Lisa on it, thinking that it is part of the report. However, Nemo steals the postcard and D.W.'s imaginary friend Nadine informs the two that the picture is part of a formula to get rid of imaginary friends. Pal then tries to get the picture back from Nemo.