Castor and Pollux were brothers from Greek mythology.
They were the sons Zeus[source needed] 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)
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.