Colonel Astrid was an officer of the Terran Federation who led the Fifth Legion during the Intergalactic War. At the end of the war, he and his unit were forced to land on the planet Sardos. There, using the mass/energy transformer on the planet, he attempted to accelerate the evolution of the Sardoans -- an experiment which resulted in the creation of Moloch. As the disastrous results of this became clear, he became suspicious of Grose's loyalties -- something which he communicated to Servalan herself.
When Astrid attempted to destroy Moloch, he was placed in a sensory deprivation tank and kept on life support. After Moloch's defeat by the Liberator, Astrid was removed from this torture by the Sardoans.
Astrid is derived from Blake's 7.