After a bubble bath, George promises the Man with the Yellow Hat that he will stay clean until their picture is taken for the cover of Bird Watchers Magazine. But when George helps Steve and Betsy dye eggs, he falls into a pot of food coloring, and turns completely yellow! Trying to keep his pledge of staying clean, he experiments with the different dye colors to see which ones he can mix with yellow to turn him brown again. In the process, George turns himself orange, Charkie turns blue, and Compass turns red! Can George figure out how to get back to his original color, or will the bird watchers return to find a rainbow colored monkey?