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Jason has the most atrocious nightmare of his life, about Lana leaving him for Clark, catching and separating them in the Kent barn and being stabbed by her. But he doesn't just wake up, but in hospital with symptoms of a continuing nightmare. Soon, many others in Smallville have similar experiences, even Clark, whose superpowers fortunately save him so he can find out the source of the epidemic is a failed experiment on Luthor Corp's fertilizer plant site, where an explosion released a hallucinogen bacteria being developed under a military contract, so he can help Lex deal with it. Meanwhile, Lionel, who had settled in prison, finds himself mysteriously scheduled to be released, which all his means could not achieve when he still desperately wanted to get out. Written by KGF Vissers
All Episodes - S04