- You may being looking for The Void, a region of space with the same name.
Matter was sucked into the void periodically by vortexes which opened and closed sporadically. Many spacecraft were engulfed in such a way, and were fored to live in the void, having no way to escape.
All the inhabitants of the Void became accustomed to preying on each other-- and on new arrivals to the Void-- to survive.
The USS Voyager was sucked into the void in 2377, and, before it could make its escape, Captain Kathryn Janeway began an alliance with other inhabitants of the void; together, the alliance was able to escape. (VOY episode: "The Void")