Episode: Orac. The crew of the Liberator head to the planet Aristo to deliver medical supplies to the computer scientist Ensor, creator of the mobile super-computer Orac. Blake and Cally require anti-radiation drugs for Avon, Gan, Vila and Jenna who have absorbed radiation on Cephlon. Travis and Servalan have also arrived on Aristo as they intend to claim Orac for themselves.