Dragon Ball Z: Saiya-jin Zetsumetsu Keikaku
English title: Dragon Ball Z: Plan to Eradicate the Saiyans
Japanese title: ドラゴンボールＺ: 外伝・サイヤ人絶滅計画
Type: OVA
Episodes: 2
Source: Manga
Genres: Adventure, Comedy, Fantasy, Sci-Fi
Studios: Toei Animation
Duration: 30 min per ep
Rating: PG-13 - Teens 13 or older

Dr. Raichii is the only Tsufurujin (the race eradicated by the Saiyajin many years ago) thought to have survived. He now is going to take revenge on the only surviving Saiyajin still alive, Goku and Vegeta. He uses machines that emit destron, a gas that will destroy all life on Earth. Now the the Z warriors only have 72 hours to find and destroy Dr. Raichii.

(Source: ANN)