Theo is a friendly and quirky hippopotamus with many unique talents and curiosities. On his first day in a new school, he is eager to learn and excited to make new friends. The other kids and cubs don't accept Theo and his peculiarities, so they bully him and make him feel unwelcome. Suddenly, a big thunderstorm causes the river to flood, putting everyone at school in danger! Will Theo spring into action and help save his new classmates, despite their callousness and cruelty?