Odin
In Germanic mythology, Odin (; from , ) is a widely revered god. In Norse mythology, from which stems most surviving information about the god, Odin is associated with wisdom, healing, death, royalty, the gallows, knowledge, battle, sorcery, poetry, frenzy, and the runic alphabet, and is the husband of the goddess Frigg. In wider Germanic mythology and paganism, Odin was known in Old English as ', in Old Saxon as ', and in Old High German as ' or ', all stemming from the reconstructed Proto-Germanic theonym .
Ood
The Tenth Doctor and Rose Tyler encounter a large number of Ood accompanying a human-led expeditionary force in "The Impossible Planet". The empathic nature of the Ood made them susceptible to psychic possession by the Beast, who formed the Ood on the base into his "Legion". While possessed, the Ood's eyes changed color to red and they killed several humans by throwing their translation spheres at them and electrocuting them. At the end of the episode, the Doctor was forced to sacrifice the surviving Ood to the black hole around the planet because he did not have time to save both them and the human crew.