A second-grade teacher and Spencer's wife who becomes pregnant with twins after his return from space. She investigates his sudden personality changes with the help of former NASA colleague Sherman Reese. After surviving a violent confrontation and a fall down the stairs, she orchestrates an electrical trap in her home to kill the alien possessing her husband, ultimately regaining her life and ensuring her children's safety.
Married couple whose relationship deteriorates after an extraterrestrial event.
Reese acts as a warning ally to Jillian, sharing critical information about the alien threat.
Jillian's sister who appears in visions and is ultimately killed by the possessed Spencer.
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