Mitchell Kosterman

Clark is unsettled when a class project has Chloe delving into his past, and Lex has problems of his own when a man he thought long dead turns up seeking vengeance.

Clark is staggered by his newfound ability to see through solid objects with X-ray vision, especially when he witnesses Lex Luthor commit a bank robbery. Elsewhere, a shape-shifting teenager threatens Lana.

Lex marries Desiree Atkins, the new teacher at Smallville High, unaware of her true motives and that he is not the only man she has been flirting with. Meanwhile, Clark struggles to control his newest power - heat vision.

An edgy janitor takes Clark's high-school class hostage at LuthorCorp, claiming his jitters were caused by a mysterious contaminant.

A lightning strike transfers Clark's superpowers to a classmate, who begins to abuse his new abilities. Meanwhile, Lex thinks he has proof of Clark's superpowers.

When Lionel is shot in the manor, Jonathan is arrested. Clark and Pete suspect that others - including Lex - may be involved, and try to find out who pulled the trigger.