Warrior is the first single album by South Korean boy band B.A.P. The single album was released digitally on January 26, 2012, and contains four tracks. The accompanying CD of Warrior was released on February 2, 2012, when the album sold 10,000 copies in two days upon its release. The album also debuted on Billboard's World Albums Chart at number 10. The lead single, "Warrior", was released on January 26, 2012 through various online digital stores. In March 2012, B.A.P released a follow-up single, "Secret Love". The mini-album peaked at number three on the Gaon Album Chart.

On January 16, 2012, TS Entertainment revealed the jacket photos of Bang Yong Guk and Jung Daehyun, thus revealing the latter as the fourth member. The following day, jacket photos of Zelo and Moon Jong Up were released, and revealed the latter as the fifth member. On January 19, 2012, jacket photos of Kim Himchan and Yoo Youngjae were released, and revealed the latter as the final member. The same day, they also released the music video teaser for their debut single, "Warrior" with TS Entertainment saying that "it carries a powerful flavor that will help bring out a fierce performance from B.A.P." TS Entertainment also announced that the title track, “Warrior”, was composed by Kang Jiwon and Kim Kibum, whose previous works include Secret's ”Magic“, “Madonna“, “Shy Boy“, “Starlight Moonlight“, as well as Bang & Zelo‘s “Never Give Up“. The group started promoting "Warrior" on KBS's Music Bank on January 27, 2012. "Burn it Up" was used as the introduction song for their debut stage in music show programs. The group also performed all the tracks of Warrior (EP) on their debut showcase held in Seoul, South Korea which was attended by 3,000 people. In March 2012, B.A.P released a follow-up promotional single, "Secret Love".

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