Dallos (ダロス, Darosu) is a science fiction Original video animation (OVA) released in 1983. It was created by Hisayuki Toriumi, as well as co-written and co-directed with Mamoru Oshii, although Toriumi’s involvement with direction is uncredited. It is widely considered the first OVA ever released.The storyline focuses on a rebellion on a Moon colony by settlers and a mysterious artifact called Dallos.