A game warden moves his family to Lake Placid, once the site of deadly crocodile attacks. Locals assure him the crocs are gone, but his mischievous young son finds a few baby crocs and begins feeding them. They quickly grow into very big adults and start attacking the game warden's family and nearby town.

Sharon Da Silva wakes up every night screaming about "silent hill". Pursued by a police officer suspicious of her motives and swerving to avoid another child her adoptive mother crashes the car knocking herself unconscious. When Rose Da Silva awakens to find her adopted child is missing, she searches the fog and ash blanketed town for her beloved daughter.

In a small town, an oil company is drilling for oil. The geologist, Dowd, informs his boss, Tenneson that they detected what could be an ecosystem which could affect their drilling rights. But Tenneson tells them to go on and something happens. Something came out and Tenneson wants to keep it quiet by keeping what came out on ice. In the town, something's been taking the fuel tanks off vehicles, leaving a big hole. Tripp, who lives in the town is frustrated at his life, specifically not having a vehicle of his own. He works at a scrap yard and he's been working on restoring an old truck. One day he thinks he hears something and traps it in the storage pit. He calls the Sheriff who's his step-father, whom he doesn't like. And when he gets there, it's gone. Later he sets a trap for it and sees it's a slug like creature who feeds on oil. He would bond with it. Later a man from the oil company shows up at the yard and asks him about the thing he reported earlier. Tripp feigns it was ...

After the death of his young daughter, Thomas Dunn is a man who has lost his faith. His life has crumbled and his confidence is shattered. Yet, on this day he wakes to discover that Mandy, his loving wife is finally pregnant again. Maybe this is their chance to move away from the tragedy of the past and for him to find his faith again. But also on this day a large alien mother-ship appears in the heavens and the people of earth are suddenly plagued with visions about the end of civilization. Tom and Mandy are split up as the mother-ship launches a massive alien fleet which attack the towns and cities of earth. Tom must look deep within himself to find not just his faith but the wisdom and strength to save the human race from the horrors that threaten them. However, first he must find Mandy, as he discovers that their new baby holds the key to the future of mankind. The battle lines are drawn and the final stance for Earth is about to begin.