User blog comment:Adventuretimegenghiskhan/Is Finn the only human?/@comment-24.88.253.166-20130405183412

It is hinted at that Finn is in fact the closest thing to the last remaining human. All other inhabitants of Ooo seem to either be mutants or humanoids. (which are still just mutants). This is my theory as to how the human race survived 1000 years without mutating due to the high levels of radiation released by the "Great Mushroom War." The Great Mushroom War is an obvious reference to a nuclear holocaust which destroyed a massive section of the Earth and began to mutate it's various denizens. This we know to have been confirmed by Pendleton Ward. After the events of the Great Mushroom War, the human race was largely wiped out. The continents farthest from the cataclysm could still, if barely, support life. The subsequent radiation spillover mutated the people of these areas, and they began to evolve over 1000 years into the various creatures which now inhabit Ooo. At the same time however, there were some humans who hid underground seeking shelter from the damaging effects of gamma radiation on the surface. These humans over 1000 years evolved separately from the citizens of the various kingdoms of the surface. Beutipia and the character Susan Strong are examples of these "separate" people who were able to escape much of the War's damaging effects- though not completely. (As can be inferred from Susan allowing Finn to feel under her hat). The only way for humanity to have survived the events of the Great Mushroom War without mutating or evolving drastically (due to dynamically different environmental factors) is for them to have maintained a similar environment as that of earth over those 1000 years. What information we have is also just as important as what we don't, and the show takes on a sort of Impressionism here. We know that many who avoided much of the radiation and fallout either evolved, or slightly mutated, into humanoids and those who survived on the surface were completely changed, and yet we have Finn who is a relatively "perfect" human specimen; unique from everything else that exists in Ooo. It is my speculation that a group of humans survived in space aboard a large space station with artificial gravity- separate from the events which unfolded on Earth. They could have, occasionally, traded with the people on the surface for supplies, and bring with them bits of technology they'd developed in order to barter for food and water. This would help us understand the relationship between Finn and Jake's parents as well, as they might have known Finns parents from trading with them. (There's a joke about "man's best friend in there somewhere). The reason Finn exists as the last human is ultimately genetic- a lack of variety in the gene pool meant that the few unscathed survivors could only reproduce so many times without suffering the effects of inbreeding. When we are introduced to the series, what we have Is the last remaining human child being adopted by the friends of the remnants of humanity who knew they could no longer prolong the human race. They became increasingly rare, and with Finns death would become extinct forever.