Wild Zero is a 1999 Japanese comedy horror film directed by Tetsuro Takeuchi. It stars Masashi Endō as Ace, a fan of the Japanese rock power trio Guitar Wolf. After assisting the group, the band's eponymous vocalist makes Ace his blood brother and gives him a whistle to blow during times of trouble. Ace later meets Tobio during a gas station robbery. The group later find themselves in the middle of a zombie outbreak.

Guitar Wolf is a Japanese garage rock power trio founded in Tokyo in 1987. They coined the phrase "jet rock 'n' roll", which they use to describe their musical style. The band is signed to Sony Music Japan's Ki/oon Records division.