Tri-Planet Alliance of Calfadoria

The Doctor had at one point met representatives of the Tri-Planet Alliance of Calfadoria. (PROSE: Business Unusual)

The Hirudon Conglomerate was a small part of the tri-planet alliance of Calfedoria. (PROSE: Instruments of Darkness)

Behind the scenes
Calfadoria and its Tri-Planet Alliance originated in Gary Russell's 1986 Audio Visuals story Maenad.