Gateways #4

Once they moved from world to world in a single step, through innumerable doors that spanned the galaxy. They were masters of space, and to those who feared them, they were demons of air and darkness. But long ago they left their empire and their miraculous technology behind. Now someone has found the key to it, and all those doors have been þung open. A world near Deep Space 9 ™, threatened with destruction from the distant Delta Quadrant, becomes the focus of a massive rescue effort as Colonel