Films: Alligator (1980)
Location: Civilized area/Lake
Height/Weight: That of a small car.
Summary: There's an old myth going around that in the sewers, there are alligators lurking about. Total hogwash...unless it's only a temporary home for them. Just hope none of them are as big and hungry as Ramone.
History: A hapless adopted baby alligator named Ramone was flushed by a girl's dad and into the sewers of Florida. Meanwhile, the corpses of dogs injected with growth formula are being dumped there to. Naturally, Ramone gets a taste of it, and grows big enough to eat people and break free into civilization.
Notable Kills: That pool kill. Imagine Captain Hook's plight, except it isn't funny in the slightest.
Final Fate: After crashing a wedding and killing some a-holes, Ramone is rewarded with a bomb to the face and the entire sewer system going up in flames. Alas, another baby gator is just waiting to make the same mistakes again...
Weakness: Anything conventional, but explosives work best.
Scariness Factor: 4-Ramone isn't the fastest on land, but he's deadly in the dark or in the water. Impressive effects make him doubly effective in the former.
Trivia: -The largest alligator was Deinosuchus, a Cretaceous crocodilian said to have a bite force greater even than the dominant theropod dinosaurs of its time, like Tyrannosaurus.
-The myth of sewer-dwelling alligators goes about as far as the 1920s, mainly in New York. It somewhat falls flat when one considers that the sewers are too cold for any gator to thrive at all.