Going off to investigate a strange noise, Mike leaves a scared Squirt alone. But Mike soon discovers that even he is a little frightened when all on his own too; Luckily, there's a musical answer to calm everyone's fears! / Mike decides that a big shield will be much better than his old one. But it soon turns out to be too big, heavy and complicated. So he needs to get his old shield back - to rescue Squirt from the Vikings!