Dragon Ball Z Gaiden: Shin Saiyajin Zetsumetsu Keikaku - Uchū-Hen (ドラゴンボールZ外伝 真サイヤ人絶滅計画 宇宙編, Doragon Bōru Zetto Gaiden Shin Saiyajin Zetsumetsu Keikaku Uchū-Hen; lit. "Dragon Ball Z Side Story: True Plan to Eradicate the Saiyans - Space Chapter") is a video game released only in Japan on December 16, 1994. It is the second part of the Gaiden: Saiyajin Zetsumetsu Keikaku series released on Playdia.
Uchū-Hen was released following the Plan to Eradicate the Super Saiyans OVA, which is an "Official Visual Guide" to the video game Saiyajin Zetsumetsu Keikaku. It is the sequel to Chikyū-Hen, which covers the first part of the OVA.
Uchū-Hen is entirely made of animated sequences based on the second part of the OVA and in which the player's task is to choose between several options to go to the next sequence. If the player makes incorrect choices, it will show their defeat or a bad ending. Goku must explore three planets, with the Dark Planet. His choice will determine the form of Hatchiyack he will confront on the Dark Planet. If he choose the first planet, Goku will meet sea monsters and will later use the Spirit Bomb to defeat Super Form Hatchiyack. If he choose the second planet, he will meet a talking stone face and a fairy, and will have to defeat Giant Form Hatchiyack on the Dark Planet. A soundtrack was later released for both games.