Timesweep (1987)

A group of people enter an old movie studio and are suddenly confronted with a variety of strange phenoma. Among other things they are transported through time and the building is surrounded by a deadly acid fog . The filmmakers also throw Roman centurions, alien spaceships and giant killer roaches at the hapless explorers, decimating the groups one by one.

Timesweep has a runtime of 82 minutes.