Starting from Douluo Continent, Sharing the Heavens

Therefore, Dai Changsheng had bought so many slaves not simply to station them on Earth, but to have them guard the entire Solar System and establish a massive space defense network. That way, if outsiders entered the Solar System, Dai Changsheng would receive word immediately instead of only reacting once they reached his doorstep. Before long, the Black Dragon spaceship carrying Dai Changsheng, along with the remaining several hundred spacecraft, passed through Earth's atmosphere and openly appeared before the people of Earth.