Alligator (1980), Alligator II: The Mutation (1991), Rogue (2007)

Alligator (1980) http://www.imdb.com/title/tt0080354/

Ramon the alligator is flushed down the toilet as a baby and grows into a gargantuan monster by eating the corpses of laboratory animals who have undergone dubious hormone experiments, thus providing all the ecological and social subtext that one could possibly wish for, even if one doesn't normally go for films about giant alligators eating people left, right, and center--which is the inevitable and tragic result of Ramon's decision that the outside world looks rather more interesting than the sewers...

Robert Forster ... David Madison
Robin Riker ... Marisa Kendall
Michael V. Gazzo ... Chief Clark (as Michael Gazzo)
Dean Jagger ... Slade
Sydney Lassick ... Luke Gutchel (as Sidney Lassick)
Jack Carter ... Mayor

Alligator II: The Mutation (1991) http://www.imdb.com/title/tt0101309/

A giant alligator runs riot in a small town with a lake connected to a sewer/drainage system. Typical plot; nobody believes the sightings until lots of people have been killed.

Joseph Bologna ... David Hodges
Dee Wallace ... Christine Hodges (as Dee Wallace-Stone)
Richard Lynch ... Hawk Hawkins
Woody Brown ... Rich Harmon
Holly Gagnier ... Sheri Anderson
Bill Daily ... Mayor Anderson

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Rogue (2007) http://www.imdb.com/title/tt0479528/

An idyllic wildlife cruise disintegrates into terror when a party of tourists are stalked by a massive man-eating crocodile. Pete McKell, a cynical American travel writer, joins a disparate group of holiday-makers on a river cruise through the waters of Kakadu National Park. Initially Pete clashes with their tour captain, Kate, a feisty young woman who assumes he is just another 'city-slicker' in search of a quick thrill. After an uneventful day cruising the river, Kate is reluctantly persuaded to steer their boat into unexplored territory. They discover a secluded lake but terror strikes when their craft receives a powerful blow from beneath the murky depths and begins to sink. With little choice, she beaches the vessel on the closest dry land -a tiny mud island. With a rising tide and only half an hour of daylight left, fear grips the group as they realize they are trapped in the lair of a 'rogue' crocodile, governed only by its need to hunt and kill. Begrudgingly, Pete and Kate join forces to keep hysteria at bay and in the process start to see beyond their initial impressions. Their first attempt to escape fails, but then Pete has an idea - they must trap the crocodile to enable the group to flee to the other side of the island whilst Kate swims for help. Pete volunteers to stand guard, but without warning, the beast breaks free and targets Kate who fails to resurface. As darkness descends and the muddy waters rise, a terrifying struggle ensues with only one probable outcome death.

Radha Mitchell ... Kate Ryan
Michael Vartan ... Pete McKell
Sam Worthington ... Neil Kelly
Caroline Brazier ... Mary Ellen
Stephen Curry ... Simon
Celia Ireland ... Gwen