Troll (1986)

"Worlds of magic, mystery and menace."

When a family moves into a San Francisco apartment, an opportunistic troll decides to make his move and take possession of little Wendy, thereby paving the way for new troll recruits, the first in his army that will take eventual control of the planet. We soon discover Torok is the ex-husband of Eunice St. Clair, a resident in the building who was married to Torok.