Nightmare shark

Nightmare shark is a 2018 shark creature feature film by the Syfy channel on Sharknado week and is probably a prequel to a nightmare on elm street.

Plot: A group of friends, all in the grip of the same nightmare, travel to a remote location to seek treatment, only to be met by some harrowing results.

Villain: great white shark that haunts people in their dreams (Nightmare Great White Shark)