
A humble shoeshine boy's alter ego battles crime.
The Bubble people create a machine to make a tidal wave to wash away all the people who live on land.
Descending to the bottom of the ocean, Sweet Polly and the Professor get captured by the Bubble Heads, hauled into the mysterious underwater city of Maldamare and taken before the emperor and the empress.
The first day of the Olympics with Polly Purebred leading the news.
Underdog is overcome by the Mighty Magnet Men; he and Polly Purebred are held prisoner.