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A flower that comes from a reopened "Level Three" of the fertilizer plant brings strange reactions from several people, including Jonathan, Lana, and Pete.
On a class trip, Clark and a fellow student named Eric are struck by lightning, and because Eric was holding a piece of kryptonite, Clark's powers are transferred into him.
A man from Lex's past stalks him in conjunction with a mysterious death at Club Zero that Lex may have been responsible for. Meanwhile Chloe looks into Clark's past as an adopted child.
Whitney falls in with some former jocks who have kryptonite tattoos that give them the power to walk through walls. Meanwhile, Chloe is seriously injured and Lex has his own plans.
A man named Sylvester asks Chloe for help but ends up getting attacked and killed. Clark is led to the former headquarters of the Justice Society of America where he meets up with Dr. Fate, Hawkman, and Stargirl. Later, Clark, John Jones, Green Arrow, and Chloe team up to help the JSA stop the killer before he murders someone else in the group. Meanwhile, Lois receives a package from a mysterious agency called Checkmate.moreless
Mikhail Mxyzptlk, a foreign exchange student and bookie, has the power to control others and uses it to sabotage football games, including the one Clark is quarterbacking. Clark and Chloe figure out his secret, but he threatens to kill Chloe unless Clark throws the next game. Mikhailcame to Smallville via LuthorCorp, and Lex will do almost anything to learn his secret.moreless
A woman forces Oliver to play in a dangerous game and then turns up dead. The police believe Oliver is responsible and arrest him. Meanwhile, Lois confronts Clark over his knowledge about Oliver's suicide attempt.
Chloe's life is threatened when Clark and Lana each make an attempt to kill her. However, when neither of them can remember what happened during the attacks, they discover that the two were hypnotized through e-mail messages. Meanwhile, Lana gets closer to Adam.