Dallos (ダロス, Darosu) is a science fiction OVA series released in 1983. It was conceptualized by Hisayuki Toriumi, who also wrote the script and directed it with Mamoru Oshii. It is widely considered not only the first OVA released but also the first animated direct-to-video production release.The storyline focuses on a rebellion on a Moon colony by settlers and a mysterious artifact called Dallos. The story and setting take influence by past works such as the 1966 feature film The Battle of Algiers and the 1966 novel The Moon Is a Harsh Mistress.