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Episode Guide

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Smallville - Season 4, Episode 10
A secret experiment that Lex is conducting at LuthorCorp goes terribly awry and causes the release of a dangerous toxin into the air. Smallville residents infected by the toxin -- including Clark, Lana, Lex and Jason -- imagine their greatest fears coming true and lapse into a coma. Desperate to find a cure, Clark gives some of his blood to Lex and is stunned at what his friend does with the antidote.