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[table][tr][td]307 (23)[/td][td]"Aliens, Plagues and Epidemics"[/td][td]September 8, 2011 (2011-09-0[/td][/tr][tr][td]This episode suggests that some microscopic lifeforms may have been extraterrestrial life that found its way to Earth on meteorites from other worlds. [/td][/tr][/table]