A couple of saltwater crocodiles somehow arrived at Black Lake in Maine, possibly by migrating from a location across the Pacific Ocean. They are discovered by Bernie and Delores Bickerman, who decided to feed them, considering them as their pets. One day, the crocodiles devoured Bernie but Delores continued to take care of them.
Two years later, one of the crocodiles devours officer Walt Lawson, therefore a team comes to Black Lake to investigate. They become aware of the existence of the crocodiles after they see the Male devouring a Grizzly Bear. Shortly after, they see Delores feeding the Femalewith a cow so they oblige her to tell them everything. Later, the team members decide to trap the crocodile by luring him outside the water with a cow and then capture him. They finally manage to capture the Male, however the Female attacks them soon after but she is blown up by a grenade launcher. Unknown to them, Delores continues to feed of the four offsprings of the two crocodiles.
Lake Placid 2
The four crocodiles eventually devoured Delores, but her sister Sadie inherited her house and continued to feed them. A few years later, the crocodiles eats several inhabitants and tourists of Black Lake, therefore Sheriff James Riley comes to investigate along with Officer Emma Warner and hunter Jack Struthers. The crocodiles also attack a group of teenagers, including the sheriff’s son Scott, and kill many of them. However, the sheriff and his teammates ultimately manage to kill the crocodiles one by one.
Lake Placid 3
In the third film, five crocodiles appear and their Alpha is the main antagonist.
Several years later, the crocodiles are presumed extinct. However, Connor, the son of Sadie's nephew Nathan, discovers some young crocodiles in the lake and decides to feed them. After two years, his parents realize the truth and Nathan goes hunting the crocodiles while Connor and his mother stay in their house but they are attacked by the crocodiles. The crocodiles also attack a group of teenagers and a team of poachers, and kill most of them. Finally, Nathan come back to his house and flees with his family to the town, followed by the crocodiles. They break into a supermarket and manage to kill most of the crocodiles inside, except for the Alpha. He continues to chase the family to a gas station, but Nathan causes an explosion that kills him. However, some crocodiles are revealed to be still present in the lake.
Lake Placid: The Final Chapter
In the fourth film, a large number of crocodiles are present and are again the main antagonists.
Due to the crocodiles' presence, a military corps puts up an electric fence around Black Lake to contain them. However, a group of poacher led by Jim Bickerman trespasses in order to capture crocodiles and to steal eggs, but most of them are killed. A group of students also accidentally enters inside the fence and are attacked by the crocodiles. Many people are devoured, but a few survivors manage to escape alive. Some times later, the crocodiles are presumed to have all died of starvation, but a crocodile still alive is seen attacking a woman.
Lake Placid vs. Anaconda
In the crossover fifth film, several crocodiles appear but they share the role of main antagonists with the Anacondas.
Jim Bickerman is hired by Sarah Murdoch to return to Black Lake and capture one of the crocodiles, in order to create a hybrid with some Anacondas. Jim successfully captures a crocodile and places him in a laboratory truck, however he manages to break out and frees the three anacondas also present. The truck explodes shortly after, which damages the fence and allows the reptiles to escape. Sarah sends some mercenaries to recapture the crocodiles and the snakes, but the crocodiles devour several of them. Later, they also eat many sorority girls at the beach of Clear Lake, however they are eventually confronted to the anacondas. Several animals of both species fight the other, but the snakes manage to kill most of the crocodiles.