EW.com has posted up the top 5 Lost" theories check 'em out.
THE ISLAND IS PURGATORY
SYNOPSIS: Oceanic flight 815 crashed. Everyone died. Some went to heaven, others to hell. The rest wound up in a dangerous purgatory, where they must work toward paradise — or risk tumbling into the inferno.
EVIDENCE FOR: Everyone seems to have something for which they need to atone. So why would purgatory look like a Tahitian resort? Well, in the famous afterlife cosmology sketched by Dante, purgatory's highest point is the Garden of Eden.
EVIDENCE AGAINST: Lost doesn't conform cleanly to any conventional explanation of purgatory. As for a more generalized application of the concept...well, that would be lame.
WHAT THEY SAY: Debunked! Says Lindelof: ''We have said that this is not purgatory, but people don't want to believe it.... These human beings have hearts, and when those hearts stop beating, they are dead.''
IT'S ALL A HALLUCINATION
SYNOPSIS: Reality on the island isn't exactly ''real.'' To boot: All characters are aspects of one person (usually attributed to Jack or potentially supernatural characters like Hurley and Walt); or everyone is still on the plane trying to survive massive turbulence by escaping into a mass delusion.
EVIDENCE FOR: Hallucinations would neatly explain many things, like Walt's comic book polar bear and appearances by Jack's dad and Kate's horse. Also, conspicuous lit references like An Occurrence at Owl Creek Bridge suggest that not everything is what it seems...
EVIDENCE AGAINST: ...or they could be red herrings, or serve another curious purpose. Also, Hurley's imaginary-friend episode, ''Dave,'' seemed to actually disprove hallucination theories. Besides, ''It's all a dream'' would have to be done brilliantly not to be a total cliché. And is Lost really going to rip off Dallas?
WHAT THEY SAY: Debunked! (Sorta.) Carlton Cuse says that any hallucination theory that denies life-and-death stakes on the island isn't valid: ''You can't invest in the show if you think it's bulls---.''
IT'S A MUTANT HOTHOUSE
SYNOPSIS: The most famous Internet theory argues that psychics are influencing the castaways for mysterious and possibly good reasons. British fan Andrew Smith's hypothesis is that the Dharma Initiative, as part of a sci-fi scheme to engineer war-free utopia, cultivated a group of superhuman beings (which may include some of the castaways) capable of wielding the island's electromagnetic energy.
EVIDENCE FOR: Check it out for yourself at 4815162342.com. There are even cool illustrations.
EVIDENCE AGAINST: Smith's theory — while inspired and well-researched — leans heavily on details from the orientation film. And as the May 10 episode suggested, Lost-ologists should reconsider the truthfulness of said film. Heck: Is Alvar Hanso even a real dude?
WHAT THEY SAY: ''Incredibly imaginative, and obviously written by someone who watches very carefully,'' says Lindelof. ''But like all great closing arguments, it doesn't incorporate any moments from the show that wildly contradict it.''
HUMANITY IS ALMOST EXTINCT
SYNOPSIS: A worldwide calamity (pandemic? nuclear war? meteor?) has wiped out the rest of humanity. By either happenstance or design, the Oceanic castaways survived the apocalypse.
EVIDENCE FOR: Various pieces of Lost arcana could be interpreted as clues planted by the producers. In science, the catastrophe that killed the dinosaurs is called the ''K-T event.'' Does ''K-T'' = Kate? One K-T scenario posits that a star dubbed ''Nemesis,'' which orbits our sun, created some celestial bad weather that ultimately caused the death of T. rex and friends. In ''The Long Con,'' the words nemesis and sun are linked in dialogue between Sawyer and Charlie.
EVIDENCE AGAINST: Those ''clues''? Crazy talk.
WHAT THEY SAY: Even Sawyer has doubts. ''If the rest of the world is extinct,'' says Josh Holloway, ''then where did those Dharma supplies that dropped from the sky come from? Then again, this could be a big government experiment, and you know as well as I do [that] if we blow this world up, they're going to be in their little bunkers down there sipping cocktails. So maybe Dharma is part of that, and they're using the island to rebuild society — but better.''
MAD SCIENTISTS ARE TO BLAME
SYNOPSIS: Passengers were brought to the island as guinea pigs in a wide range of experiments, like studying the effects of electromagnetic energy on humans. The monster
(a.k.a. ''Cerberus'') is a watchdog whose primary job is to keep test subjects from straying outside the EM section of the island. The Others could also be test subjects...the scientists themselves...or a faction of ex-scientists who now oppose the experiments.
EVIDENCE FOR: Electromagnetic energy may have healed Locke's legs, Rose's cancer, and Jin's infertility. The map in the hatch suggests a Dharma-explains-everything solution (that's where we got the Cerberus thing). And even if the map is bogus, the hatches and the Dharma supply drop suggest that an ''initiative'' is (or was) at work on the island.
EVIDENCE AGAINST: ''The Other 48 Days'' episode clearly showed the plane crashing. Doesn't that seem like a really risky way to recruit lab rats?
WHAT THEY SAY: This is the view most commonly held by the actors. Daniel Dae Kim thinks the castaways are part of ''a human ant farm'' run by the Dharma Initiative. Harold Perrineau's take is more ironic: He thinks scientists are using the island to test a new one-world religion. And Holloway has a darker view. ''The island is like a working machine. It's mobile, like the Death Star. That one thing — the button — keeps it from becoming the ultimate weapon.'' Then, flashing that dimpled Sawyer grin, he adds: ''Or whatever.''