Stephanie Green is the mother of Clancy Green, the patient in the Season 3 episode Cane and Able. She is married to Todd Green. She was portrayed by actress Sheryl Lee.
Stephanie is first seen when she is trying to convince Clancy to go to sleep. She finally gives up and leaves the matter to Todd.
The next morning, when Todd can't find Clancy in his bedroom, she say it would be a big change if he was already up. Unfortunately, they find him unconscious on the lawn.
Because of Clancy's belief he is being stalked by aliens, Stephanie believes he has some sort of mental illness despite the reassurances of Robert Chase.