What: Heat Vision Power
When: In episode number two of the second season, "Heat."
First Use: Clark first used his Heat Vision power accidentally during his Biology class because he was watching his "hot" teacher, Desiree Atkins. He set fire to the projection screen and the wall in the Talon. Desiree accused him of setting fire to her car, also. Later, his father helped him to control the power, and he used it to escape from jail and to save Lex's life from a bullet.