The Teplan homeworld was a planet in the Teplan system in the Gamma Quadrant, just outside Dominion space. It was the home planet of the Teplans. The planet had an advanced civilization until the mid-22nd century. The Teplans built cities, traveled to neighboring worlds and believed nothing was beyond their abilities. But when the Teplans defied the Dominion, the Jem'Hadar destroyed their world and introduced the blight into the population.