Watch Online Free on Watchseries. When Melissa leaves her fiancé Andre at the altar, her best friends convince her to go to a Cabin in the woods on a much needed “Girls Trip” to get her mind off things. But things take a huge turn when their friend Jenny is found mutilated in the middle of the woods. When the news announces an all out Alien attack on the Nation, the girls will now have to try their best to survive.