Meteor dust causes Lex to revert mentally to the age of five ( Read more... )

A freak accident involving a string of Christmas lights and meteor-rock affected trees results in a body switch for Clark and Lex. The guys try to adjust to the situation, with Lex (in Clark's body) staying at the Kent farm, doing farm chores, and going to Smallville High. Clark (in Lex's body) stays at the mansion, goes to work at the fertilizer ( Read more... )

Clark, Pete and Lex are at the hospital when an unidentified contagion results in a lockdown. Pete's niece, Celia, is already being treated, and eventually Pete comes down with it, as well ( Read more... )