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Happy sees a very questionable-looking puddle that he is determined to splash in, much to the horror of Duggee, the other Squirrels and the tiny citizens of Midgetropolis who live inside it!
Duggee and the Squirrels hop inside the Biology Bus and miniaturise themselves to go on a voyage of discovery inside Enid. Can they find out what's making her cough?
The Squirrels have played all of their board games, so Duggee entertains them by putting on a game show, with some help hosting from his good friend Ladybug.