Aleph-777

Aleph-777 was a planet known for its tranquillity and idyllic peace and inhabited by humans who were known to be the most peaceful in the galaxy. It was home to the ultimate armament which the planet's inhabitants sought to protect and sacrifice relying on it as a last resort of survival against threat.

History
The Sontaran Katsu arrived on the planet in a quest to find the ultimate armament for his own use. Here he attacked the people at a village in order to aquire it but they wouldn't let him have it. Eventually he left when he was told they didn't have it anymore and saw a ship leaving which supposably had it on there to which he went on pursuit after it. (DWM: The Final Quest)