Halloween II (1981)
In this sequel that picks up directly after the end of the original, Strode is on her way to the hospital, wondering why Michael attacked her so relentlessly. She has a dream about being younger and meeting a boy that she doesn’t remember. When she wakes, she finds that Myers has killed many in the hospital as he continues to stalk her.
Loomis finds out that Michael and his sister Judith are actually Strode’s biological siblings. She was put up for adoption after the death of their parents. Loomis arrives at the hospital and, knowing that Michael Myers would not stop trying to kill Strode, causes an explosion that blows up Myers.