Given the question: Build a movie plot around this: who encounters a large group of disfigured monsters? It doesn't say anything about a large groups of disfigured monsters.
The answer is:
"SHARON! Where are you?" We first hear Rose DaSilva (Radha Mitchell) shouting these words as she and her husband Chris (Sean Bean) search for their daughter Sharon in the middle of the night. Rose runs beneath a highway through some kind of river and finds herself standing over a gigantic waterfall. She sees Sharon (Jodelle Ferland) standing on the other side in a trance (she sleepwalks). We see from Sharon's point of view the world literally falling apart and becoming some kind of hell (think the Hell LA sequences in Constantine). Just before Sharon sleepwalks off the cliff, Rose gets to her and wakes her up, where she starts screaming, "Silent Hill! Silent Hill!" over and over. Chris arrives and reassures his wife and daughter, although it's obvious both him and Rose know it's far from alright.Two years later. Sharon is leaning against a tree and coloring in a picture of herself and a lion near the tree. Rose comes up and her and Sharon play around a bit. She then tells Sharon about her sleepwalks and how she keeps mentioning Silent Hill. Sharon says that she doesn't remember, but Rose replies with, "That's why we're going there...so you can remember." They leave and head out, passing a sign that basically says angels shall be judged by saints -- people -- and not the other way around. Meanwhile, we see Chris trying to contact his wife, who is continually ignoring his calls (apparently this trip was not made to include him). He begins looking at some of the websites Sharon pulled up on Silent Hill, and he learns that it is located in West Virginia, is considered one of the most haunted towns in America, and that 30 years ago, there was a large underground fire that pretty much killed everyone there.That night, Sharon and Rose pull into Braham's Gas Station, which is within spitting distance of Silent Hill. As she gets out, Rose notices Sharon's pictures and sees that they've been changed to show people burning in various buildings, like a church or a school. Sharon wakes up and Rose asks her about them, but...