Carter pretends to be of humble origins in order to impress Anna, which fails when she finds out he actually comes from a wealthy family. Despite this, the two still become good friends, and she helps Carter help his cousin Chase detoxify from a heroin addiction. She had experience in the subject, considering her ex-boyfriend went through a similar experience. Unfortunately, their efforts were in vain, because Chase started using again, eventually crippling him for life. At the end of the season, Anna's ex-boyfriend comes to the hospital to see if the ER is in need of a pediatrics attending. Anna is still in love with him, and faces a decision about her future in the ER. While Mark is away, a large explosion sends multiple patients to the ER. Weaver briefly suffers a seizure after being exposed to the toxic fumes. Mark returns and has fully recovered from his beating.