Alligator - ( Horror / Creature ) - 1980

A pet baby alligator is flushed down a toilet and survives in the city sewers. Twelve years later, it's grown to 36 feet long, thanks to a diet of discarded laboratory test specimen dead dogs bodies, illegally injected with growth hormones., it has now outgrown and eaten everything in the sewer.
So It breaks out into the city. Humans are now it's prey .
Can a a zoologist specializing in reptiles, and a Cop stop the monster?