A Group of biologists go on a rescue mission to Hell Island, but they find themselves threatened by giant crocodiles - and a mega crocodile - and their fight for survival begins.

In 1925, a giant crocodile accidentally escaped from its cage and wounded people wantonly in Beihai City. Seventh Brother Orion and his apprentice Tiansheng were invited by the police chief to go to Beihai, and the master and apprentice worked together to capture the crocodile. But what they didn't expect was that a bigger crisis was hitting them...