Dragon Ball: Super Saiya-jin Zetsumetsu Keikaku

A deadly gas begins spreading across Earth from strange machines planted around the planet. Goku, Gohan, Vegeta, Trunks, and Piccolo learn that the attack is tied to Dr. Raichi, a survivor of the Tuffle race destroyed by the Saiyans long ago. Driven by hatred that has endured beyond death, Raichi has prepared a plan aimed not merely at revenge, but at erasing the surviving Saiyans altogether.

Destroying the gas generators only leads the fighters deeper into Raichi's trap. Familiar enemies return in ghostly form, and behind them waits Hatchiyack, a machine that has gathered generations of resentment into overwhelming power. To save Earth, the group must overcome enemies they once defeated and confront the hatred born from the Saiyans' own violent history.