Although there are stunt people on the sets for each episode, the cast is more than willing to take on some of the stunt-work themselves. Welling and Schneider performed a lot of their own stunts for the scene where Clark and Jonathan, who now has the powers to take on his son, battle over Clark's use of the red kryptonite in "Exile". This lent to the filmmakers being able to show more of the two actor's faces during the scene, which also lends more realism to the audience. As part of the opening scene for "Extinction", which involved Lana being attacked in the school pool, Kreuk spent thirteen hours in the water as they filmed the scene.