In Smallville’s fifth-season finale, Clark’s kryptonian origins threaten the Earth and the population, which Clark must make a huge sacrifice and a decision. This decision will affect all of the citizens around him, affecting Lex, Lionel, Lana and Clark are set in motion, in the moment for which all his trials have prepared him for. Meanwhile Milton Fine unleashes a deadly virus that effects millions, and Lionel is again channeled by Jor-El who helps Clark (Kal-El) in the on sought battle between good and evil.