Castor and Pollux

Castor and Pollux were brothers from Greek mythology.

They were the sons Zeus and Leda. Castor was a skilled horse tamer, and Pollux was a pugilist. The Doctor related that a saying on the colony world of Aractus was "Never turn your back on a swan". (PROSE: Wooden Heart)

As sons of Zeus, they were siblings of Apollo, Athena, Artemis, Dionysius, Hebe, Heracles, Minos, Hermes and Persephone. (PROSE: Deadly Reunion)

Other references
Castor and Pollux's names were used for the alpha and beta versions, respectively, of the intelligent core for Perseus Dynamics' Peacekeeper project. (PROSE: Thinking Warrior)

Behind the scenes

 * The line "Never turn your back on a swan" in Wooden Heart is a reference to Zeus - the father of Castor and Pollux - who took the form of a swan.