Skultos

Skultos was the homeworld of the Skullions. When Sarah Jane Smith freed a group of enslaved Skullions on Earth, Mr Smith sent a message to Skultos to send a ship to pick them up. (TV: The Man Who Never Was)

The inhabitants of Skultos had technology more advanced than that of the human race, and could use holograms with hypnotic powers. (TV: The Man Who Never Was) However, this technology was quite limited as the holograms would only function properly if the Skullions were operating it for the entire time (TV: The Man Who Never Was).