Argone

Argone was the planet that Piritus Elgon was confined to for his "scientific crimes". Confined to a castle prison, Elgon however managed to continue his genetic experiments resulting in the creation of a new species, the Screamers, a product of human and Argonian DNA. The Screamers were confined to the castle following Elgon's death by the authorities on the Eleventh Doctor's request. (COMIC: Screamers!)