Adventure Time: Islands - 8 part special starts Jan 30
About the Mushroom Wars. You can also buy it on Jan 24.
Adventure Time Will Explore Finn The Human's Past In A New Eight-Part Special http://www.gizmodo.com.au/2016/12/adventure-time-will-explore-finn-the-humans-past-in-a-new-eight-part-special/
In Adventure Time: Islands, Finn (voiced by Jeremy Shada), Jake (John DiMaggio), BMO (Niki Yang) and Susan Strong (Jackie Buscarino) leave the Land of Ooo to embark on a quest of epic proportions across the ocean and into new lands — encountering new creatures, discovering new islands and using teamwork along the way.share