In Pink Hamster and the Big Birthday Surprise, Pink Hamster has an obsession with birthday cake. She can't get it out of her mind and dreams about it at night. Today is Pink Hamster's very favourite day her birthday. She has been thinking about a birthday party, singing, presents, and lots of cake. But the unthinkable is happening all the hamsters, even her best friend Green Hamster have forgotten that today is her birthday. Will she get her beloved cake and some birthday wishes or will it turn into her worst birthday ever?