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Servalan investigates a planet which contains an unknown substance of potential usefulness whose investigation team mysteriously died. The crew learn of Servalan's trip and decide to investigate for themselves.
Datum prvog emitiranja : Jan 02, 1978
Datum posljednjeg emitiranja : Dec 21, 1981
Epizoda : 52 Epizoda
Sezona : 4 Sezona
Vrijeme izvođenja: 50 minuta
Studio: BBC One
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