Morty (Cornered!)

Morty is the hidden main antagonist of the 2010 slasher film "Cornered!"

Cornered!
Los Angeles is being terrorized by a masked serial killer whose modus operandi is to break into stores after hours, murder the workers, and take the surveillance tapes so he can use them to relive his crimes. At Steve's liquor store (the main door to which has been boarded up due to an incident with a homeless man) the employees, customers, and a deliveryman named Morty discuss the killer, the $500,000 being offered as a reward for his capture, and how they would kill him, the mentioned methods being eye gouging, exsanguination in plastic wrap, sawing, and decapitation. After the store closes, Steve has a clerk named Donny, and two regulars (a prostitute named Jess, and a phone sex worker named Mona) stay to play cards in the upstairs apartment as a means of keeping Steve's nephew Jimmy (an addict going through drug withdrawal) occupied. Unbeknownst to the quintet, the Convenience Store Killer has chosen them as his next victims, cutting the homeless man (who resides in a nearby alley) in half before sneaking into the building.

When Mona goes downstairs to look for the source of strange noises, the Convenience Store Killer stabs her in the eyes with cornettos, and hides her body in a freezer. Later, Jimmy and Steve are also killed, the former by being stabbed while wrapped in plastic, and the latter by being bisected with the deli's meat saw. Donny and Jess witness Steve's death on a security monitor, and after finding the bodies of Mona and Jimmy, realize the killer is murdering them in the ways they said they would kill him, and that they are trapped in the store without any way to contact help. Forced to try and survive until Morty drops a delivery off at dawn, Jess and Donny find the hidden room where Steve keeps his surveillance equipment, and seal themselves in it.

Morty eventually arrives, and has Jess help him try and seal the killer in the basement, so they can claim the reward money. Donny accidentally rewinds Steve's surveillance gear to the earlier discussion about the killer, which causes him to realize that Morty is the murderer, as he is the only one who could have known about the ways the group had said they would bring down the Convenience Store Killer. Jess is beheaded (the way she said she would dispose of the killer) while trying to escape, and Donny is knocked unconscious. Donny awakens with Morty about to kill him, but realizing that Morty needs the surveillance tapes, Donny taunts him by saying that only he knows where Steve's surveillance equipment is hidden. After Morty has Donny show him where the tapes are, the two get into a fight, which ends with them knocking each other out. Hours later, the authorities arrive, and it shown that Morty had killed Donny by force-feeding him donuts (his favorite food).

At another store, the customers and employees discuss the recent massacre, with the owner saying that it is nothing compared to what he would do to the Convenience Store Killer. Morty appears, and asks, "Oh yeah? What do you have in mind?"