The people of Earth behave like zombies in Episode 13 of Uchu Sentai Kyuranger, Stinger Challenges His Brother.
Space.13: Stinger Challenges His Brother
Directed by Teruaki Sugihara
Written by Nobuhiro Mori
The people of Earth begin rampaging like zombies. The Kyurangers fight against Daikan Mondomuyoindaver who’s become zombie-like, but then zombies attack Hammy. Stinger clearly sees people have been infected with poisons, and he detoxes and saves Hammy. Because Stinger was able to detoxify on his own, he has a hunch that his older brother Scorpio is behind this.
Scorpio: From the Scorpius Constellation. He shares the same name as Stinger’s older brother, but who is he really?