AllMovie

While attempting to destroy a Federation communications base on Saurion Major, Blake (Gareth Thomas), Vila (Michael Keating), and Avon (Paul Darrow) find a new ally in the form of Cally (Jan Chappell), a telepathic alien and sole survivor of a guerilla organization on her own planet. Meanwhile, back on the Liberator, Jenna (Sally Knyvette) and Gan (David Jackson) are faced with a long-dormant death squad, which is fiercely guarding an ancient genetics bank -- and is willing to kill anyone who crosses its path. This episode, which originally aired January 23, 1978, marked the series debut of Peter Tuddenham as the voice of master computer Zen.