S3, E4: "Think in the Rink" Duck and Dog want to join Sheep and Frog in their ice skating show. Although Frog warns Duck and Dog to be careful as they practice, the enthusiastic duo gets carried away and carelessly break the ice skating rink. Will Duck and Dog think up a good solution to the problem before the show begins? "X Marks the Spot" Duck must search high and low for his letter X that has gone missing. His good pal Shark accompanies him. Duck hears the letter X everywhere he goes, but why can't he find it? And why does Shark have a stomachache? Both mysteries are solved when Frog builds an X-ray to look inside Shark's stomach.