Clark is effected by red kryptonite, which turns him into a rebellious teen. Lana is drawn to the "new" Clark, who tells her of his love for her.

What's up with Clark? After wearing his new class ring, Clark becomes rebellious and flirtatious. He tries to entice Lana, Chloe and Pete away from studying to go out to party, goes on a spending spree with mom and dad's credit card, takes off on Jonathan's motorcycle, peeps Chloe and Lana with his x-ray vision, and generally turns into a "bad" boy. Guest-star Sara Downing portrays "Jessie" in this episode. Regular WB viewers will recognize her from appearances on past dramas "Roswell" and "Dead Last," as well her film appearances in several teen thrillers.

Who is Jessie? New girl at school Jessie comes to Smallville with big city attitude and an instant attraction to Clark. She and her father fled protective custody and are now being hunted by Ted Palmer, U.S. Marshall turned hired gun, who wants dad's computer disks, implicating a big corporation. The hired gun is so ruthless. He's already killed Jessie's Metropolis boyfriend to discover the family's whereabouts. What's up with the Kents? At first Martha thinks Clark is going through a normal "teen rebellion" phase. After more uncharacteristic disrespect from Clark, they are suspicious of his drastic change in behavior. Clark goes as far as telling Jonathan he's not his father and slamming him into his truck. Martha enlists Pete's help to discover the source of the change in Clark.

What's up with Pete? After Chloe discovers the bogus precious stone in the class ring is red kryptonite, Pete understands its effect on Clark and tells the Kents. They realize that just as green kryptonite weakens Clark, red kryptonite effects his emotions.

What's up with Lana? The "new" Clark openly flirts with Lana, tells her of his feelings for her, and kisses her passionately. They go on a date in Lex's borrowed Ferrari to a wild bar. Clark wants to drink and dance, while Lana wants to leave. They bump into Jessie who dances with Clark. Jealous and offended, Lana starts to go, with Clark holding her back. A couple of big guys step in and Clark starts a brawl. The bartender calls the hired gun looking for Jessie, setting him on the trail.

What's up with Lex? Dad Lionel is feeling sorry for himself in his blindness. Lex tries to adjust to having him live at the mansion. After Clark's night out in the Ferrari, he confronts his parents, telling them he's leaving home. He stops in at the mansion to tell Lex the news, bragging that he wants to show the world what he's capable of. Lex tells him he'll join him in leaving Smallville, and delays Clark. Meanwhile he goes to tell Jonathan.

How it ends: The hired gun tracks Clark down at Luthor mansion. When he threatens Clark with a gun in front of Lionel, Clark shoots his own hand in a display of invincibility. Clark goes to Jessie's house to collect the computer disks when he learns of their value. The hired gun follows him. Jessie's dad shoots the hired gun when he threatens Jessie. She runs out. Clark tears up the house looking for the disks, nearly killing Jessie's dad. Then he runs out into a field after Jessie. Pete and Jonathan corner Clark, weakening him with green kryptonite, while Jonathan breaks away the red kryptonite from Clark's school ring, freeing him from the ill effects. Later Clark apologizes to his parents for his behavior. He is confused by the experience of his altered emotions. Clark also apologizes to Lana, but can't explain his behavior to her. He has the chance to tell her how he really feels, but cannot. Upset, Lana won't accept his apology or friendship.