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 favorite day! Her birthday. She has been thinking for weeks about a birthday party, singing and eating lots of cake. But the unthinkable is happening! All of the hamsters have forgotten her birthday. Will she get her beloved cake and some birthday wishes or will it turn into her worst birthday ever?