Not only does Clark have to deal with his first flashes of x-ray vision, but he witnesses Lex fleeing from a bank robbery. As he struggles to control his new power, Clark discovers that a Smallville teen has the ability to shape-shift and is after Lana.

What's up with Lex? "Lex Luthor" shows up at the bank to close his accounts. When the bank manager questions his signature, Lex pulls out a gun and robs the bank. Fleeing, he runs into Clark, throwing him through a window. The jolt causes Clark to get his first flash of x-ray vision, seeing green glows (kryptonite?) in the body of the robber. The next day, Lex tells the Kents that he didn't rob the bank, as he was in Metropolis hosting a business reception. Because of the robbery, a tabloid journalist digs up some whitemail material on Lex. He threatens to publish it, if Lex doesn't pay him off. Lex reverses the whitemail on the tabloid journalist, and enlists his help to solve some mysteries, like how he survived the car crash.

Who's Tina Greer? Tina is a local teen, a shape-shifter who appeared as Lex to rob the bank, stealing the money for herself and her mom. Her mom finds out, and wants to return the money. In a struggle, mom accidentally falls down the stairs, dead at the bottom. Tina is also a friend of Lana's, and envies Lana's life. Hiding her mom's accidental death, Tina asks Lana about staying with Lana and her aunt, and tells a cover-up story about her mom planning a move to Metropolis.

What's up with Clark? At the school gym, Clark gets a headache. Next he's seeing through Pete's skin, and is peering through the walls into the girls locker room for a glimpse of a nude Lana, getting dressed! On the street, Clark sees everyone as skeletons. He notices one body has a green glow inside...it's Tina. Clark and Mrs. Kent follow into the antique shop. Mrs. Kent talks to Tina's mom Rose Greer (really Tina, shape-shifted), and spies a stack of cash on the floor. "Rose" (Tina) sneaks keys from Mrs. Kent's handbag. When she leaves, "Clark" (Tina again) almost runs down Mrs. Kent with their truck.

What's up with Martha Kent? Mom, Dad, and Clark figure out that Tina was affected by the meteor shower. Mom suspects a tie between Tina and the bank robbery. As they discuss his x-ray vision, Mom encourages Clark to try to focus his power to control it.

What's up with Lana? Finding her mother's diary, Lana discovers she was unhappy with small town life. Lana searches for the controversial text of her mom's graduation speech to find out more. Clark worries about Lana when he sees Tina talking to her. Focusing his x-ray vision, Clark sees stacks of cash in Tina's locker. The deputies come for Tina, but she escapes by shape-shifting. Realizing it was Clark who ratted her out, Tina visits Clark in the barn, shape-shifted, appearing as Lana. "Lana" (Tina) kisses Clark, then shape-shifts back into Tina, and pushes Clark from the loft. Later, "Lana" (Tina) kisses Whitney and asks for his letter jacket. Tina shape-shifts into Whitney that night at the cemetery, where she finds Lana. "Whitney" (Tina) tells Lana she doesn't deserve her life. Shape-shifted back into Tina, she chokes Lana and locks her in a tomb.

How it ends: Clark and Pete finds Rose Greer's body, and they know Lana is in danger from Tina. Clark rushes to the cemetery, searching for Lana. "Whitney" (Tina) is there, and they struggle. Clark rescues an unconscious Lana from the tomb. When everyone is safe, the real Whitney rushes to Lana. They embrace and kiss. Clark asks his mom, "What would you do if you could see anything?" "Learn to close my eyes," Mrs. Kent replies. Alone later, Lana listens to her mom's graduation speech from a cassette tape given to her by Chloe. Lana is touched and inspired by her mother's words, "I never made a difference here, but maybe my children can."