Serpent
The Mara was described as a serpent. (TV: Snakedance [+]Loading...["Snakedance (TV story)"]) Before peace was signed, the Great Houses created artificial serpents which they sent to the Osirian Court to devour Ra, (AUDIO: Coming to Dust [+]Loading...["Coming to Dust (audio story)"]) of which the greatest was Apep, until the Osirians managed to reprogram him. (PROSE: Going Once, Going Twice [+]Loading...["Going Once, Going Twice (short story)"])
Kara Seddle called Davros a serpent in the paradise of her company when hiring Orcini, a Knight of the Grand Order of Oberon, to kill him and his Necros Daleks. (TV: Revelation of the Daleks [+]Loading...["Revelation of the Daleks (TV story)"])