Two scientists, working at the National Sciences Building in Washington D.C., discover a way to peer into the thousands of other dimensions. Some are very alien, some very similar to our own planet. When they are demonstrating their invention to a group of military people something goes awry--and they are all physically transported to a primitive world. Basically, it looks like Earth except there are a few more moons--and it's inhabited by creatures that look like a cross between dinosaurs and the vampires from BLADE II. One such monster keeps on attacking the building they've been transported in. Of course, the group of people divide into factions, there are some weasely characters that get their comeuppance. One woman is convinced there's intelligent like on the planet when she sees a constructed tower--but after she braves the woods she's sorely--and fatally--disappointed.
I found this somewhat similar to the TV series SLIDERS, though a bit more intense.