The supreme ruler and creator of the universe in Malacandran theology. The Old One does not have a corporeal body but lives everywhere in the heavens and watches over every living thing through his deputies, the oyarsas (of which Oyarsa is the guardian of Malacandra). Roughly analogous to the Christian concept of God.
The timeline below shows where the character The Old One appears in Out of the Silent Planet. The colored dots and icons indicate which themes are associated with that appearance.