Demons / Demons 2

A double bill of Lamberto Bava (son of Italian horror-maestro Mario Bava) horror films. The first sees a bunch of cinemagoers invited to a special film show. The film in question is a gruesome slasher flick, and as the screening progresses members of the audience begin inexplicably transforming into hideous blood-thirsty demons.

The rest of the audience tries to escape, only to discover that all the exits have been walled shut... In the sequel, the demons are back, spreading through the television screens of a modern apartment building, turning the residents into fanged, clawed monsters. The exits are sealed, the power has been cut off, and the number of human survivors grows smaller with every passing minute....