Deban

The Debans were one of the intelligent species on Belstar. They were at war with the Siros. A storage device with information crucial to the conflict, a blue rock, was stored by the Siros in the Crypt of Primo. The conditions around the crypt made it unreachable by the Debans, so they sent the Sixth Doctor and Peri to retrieve it for them. (PROSE: Battle Planet)