Proscenia

Proscenia was a large planet, home to the Addos and the Logos, a pair of species linked by a powerful mental bond. Together, they had built an entire civilisation out of light. The Addos were invisible beings made of creative energy, capable of using the light to create ships that the Twelfth Doctor considered the most beautiful in the universe. The Logos were a humanoid species and the Addos' greatest admirers, without whose appreciation the Addos could not build anything. (PROSE: Behind You) The actress Rose Leclerq, who played Lady Bracknell in The Importance of Being Earnest at its 1895 premiere, was an alien from Proscenia. She attempted to paralyse the audience with uncontrollable laughter to create a sound beacon that would signal her people to invade earth. (PROSE: The Importance of Being Strax)