<P> The series' voice actors include: Jeremy Shada (Finn the Human); John DiMaggio (Jake the Dog); Tom Kenny (The Ice King); Hynden Walch (Princess Bubblegum); and Olivia Olson (Marceline the Vampire Queen). Ward provides voices for several minor characters and Lumpy Space Princess . Former storyboard artist Niki Yang voices the sentient video game console BMO in English, as well as Jake's girlfriend Lady Rainicorn in Korean . Polly Lou Livingston, a friend of Pendleton Ward's mother Bettie Ward, plays the voice of the small elephant named Tree Trunks . </P> <P> The Adventure Time cast members recorded their lines together at group recording sessions rather than individually, with the aim of recording natural - sounding dialogue . Hynden Walch has described these group recordings as being akin to "doing a play reading--a really, really out there play". The series regularly employed guest actors for minor and recurring characters, and crew members cast people with whom they were interested in working . For instance, in a panel, both Adam Muto and Kent Osborne said the Adventure Time crew often sought out actors who had had roles in the television programs Star Trek: The Next Generation and The Office to play various supporting or background characters . </P> <P> The show is set in the fictional "Land of Ooo", in a post-apocalyptic future about a thousand years after a nuclear holocaust called the "Great Mushroom War". According to Ward, the show takes place "after the bombs have fallen and magic has come back into the world". Before the series was fully developed, Ward intended the Land of Ooo to be simply "magical". After the production of the episode "Business Time", in which an iceberg containing reanimated businessmen floats to the surface of a lake, the show became explicitly post-apocalyptic; Ward said the production crew "just ran with it". Ward later described the setting as "candyland on the surface and dark underneath", noting he had never intended the Mushroom War and the post-apocalyptic elements to be "hit over the head in the show". He limited it to "cars buried underground in the background (and other elements that do not) raise any eyebrows". Ward has said the series' post-apocalyptic elements were influenced by the 1979 film Mad Max . Kenny called the way the elements are worked into the plot "very fill - in - the - blanks", and DiMaggio said, "it's been obvious the Land of Ooo has some issues". </P> <P> The series has a canonical mythology--or, an overarching plot and backstory--that is expanded upon in various episodes . The backstory involves mainly the Mushroom War, the origin of the series' principal antagonist the Lich, and the backstories of several of the series' principal and recurring characters . Ward has said the details behind the Mushroom War and the series' dark mythology form "a story worth telling", but that he feels the show will "save it and continue to dance around how heavy the back - history of Ooo is". </P>

When does the story start in adventure time
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