Fionna, her best friend Cake and the former Ice King, Simon Petrikov, embark on an adventure through the multiverse, dodging new threats and making self-discoveries along the way.Fionna, her best friend Cake and the former Ice King, Simon Petrikov, embark on an adventure through the multiverse, dodging new threats and making self-discoveries along the way.Fionna, her best friend Cake and the former Ice King, Simon Petrikov, embark on an adventure through the multiverse, dodging new threats and making self-discoveries along the way.