Some of these pictures and descriptions may give away plot details that you might not want to know before watching the film.
This is a werewolf movie based on a story by Stephen King. As usual in his stories, it takes place in a small town in Maine. At the beginning, we see people at a town fundraising picnic in a park. As a minister starts his speech, a 14-year-old girl named Jane Coslaw (Megan Follows) asks her parents if she can leave. Her mother tells her to make sure her brother is alright as Jane she walks away.
We see the face of Jane's 11-year-old brother Marty (Corey Haim) amazed to see a snake on the ground as it is picked up by his friend Brady (Joe Wright). Marty holds the snake as Brady says he has an idea and looks over at Jane. Marty is skeptical of using the snake to scare Jane, but he eventually agrees, telling Brady not to "go bananas." Then we see Jane walking in the park, calling out for Marty, as she walks under the snake dangling from a tree. Seeing the snake shocks her and she falls to the ground as the boys laugh. She looks up at Brady who is up in a tree holding the snake and curses at him. Then Marty rides up in his motorized wheelchair named "the silver bullet" and says "Come on Jane, it's just a garter snake." She screams that her stockings are ruined and that she hates them. She starts to get up, crying, as Brady throws the snake down at her, which makes her fall over again, this time into a puddle of water. Marty apologizes, but Brady keeps on laughing. This lets us know what a jerk Brady is so we don't feel too bad later when he is torn to pieces by the werewolf.
Marty tells Jane that the snake is "...just a garter snake" but it's actually the striped form of the Eastern (or Yellow) Rat Snake. Rat snakes are not found in Maine, but they're not far south, though striped rat snakes are mostly found in the southeast, typically in Florida. Gartersnakes are found in Maine and they also have stripes, but they're nervous and don't stay still for long, which makes them harder to use on a movie set than rat snakes, which are typically a lot calmer. That's probably why they used a striped rat snake to portray a gartersnake.
You can watch the movie and read a full synopsis of it at TheSilverScream.com.