On April Fool's Day, a young Duck's fancy turns to thoughts of... practical jokes! In Robert Klein's "Greatest Hoax of All Time," Donald convinces Uncle Scrooge that the aliens have landed! Then Mickey faces a rematch with Pat McGreal's 11th Dimensional Imp in "Mates in Mischief!" Brer Rabbit foils Brer Fox with "The Molasses Well," while Emil Eagle sics "The Ro-Brat" on Gyro Gearloose in a never-before-published Tony Strobl saga. Finally, Donald's nephews meet Carl Barks' "Smugsnorkle Squattie," an exotic dog that's specially trained to do... nothing special!