The Moxolon Swamp Vipers were a race of poisonous snakes.
The Moxolon Swamp Vipers were snakes with horns on their heads, four eyes, long sharp teeth and a tail split in two at the end. Their bite was poisonous and the poison fatal. The poison caused weakness, heightened pulse rate and increased blood pressure. (TV: The Vault of Secrets)
The Moxolon Swamp Vipers lived on a swamp planet in the Calysteral cluster that the Judoon used as a prison. Androvax was bitten by a Moxolon Swamp Viper before escaping the planet. Before he died, he wished to free one hundred of his species that were cryogenically frozen and had crashed on Earth. (TV: The Vault of Secrets)