Gamma Quadrant

One of the four Quadrants of the Milky Way Galaxy. It's inhabitants include (but are not limited to) the Changelings, Vorta, Jem'Hadar and T-Rogoran (all of whom are members of the Dominion).

A wormhole was found near planet Bajor and space station Deep Space 9 that connected the Gamma Quadrant with the Alpha Quadrant, the discovery of which eventaully led to the Dominion War.