The victim of Servalan's (Jacqueline Pearce) latest double-cross, the son (Tony Caunter) of celebrated scientist Ensor lays dying. As he breathes his last, he tells Blake (Gareth Thomas) of the existence of Orac, a super-powered computer created by Ensor. Meanwhile, Avon (Paul Darrow) is given the opportunity to fulfill a prophecy from his own people, and Jenna (Sally Knyvette) is captured by hostile aliens on the planet Cephelon. "Deliverance" made its first TV appearance on March 20, 1978. ~ Hal Erickson, Rovi