When a freak reading accident causes Twilight to be admitted to the Ponyville hospital, Rainbow Dash is right by her side. Compelled by a sense of duty and repayment, she takes it upon herself to cheer up her friend.

Is Mr Cake literally a cake? Pinkie Pie seems to think so – but will her investigations really reveal that Mr Cake is made solely from delicious margarine, sugar and flour, or is something else afoot? One thing is certain – the Cakes are hiding something from her, and Pinkie will expose the truth no matter the cost!