"The Baddest" (stylized in all caps) is a song by augmented reality K-pop girl group K/DA. It was released as a single on August 27, 2020, and is the lead single from their debut extended play All Out. It is K/DA's first song since "Pop/Stars" in 2018. The song was composed by Riot Music Team in collaboration with Bekuh BOOM. The song was accompanied by a lyric video which was uploaded to League of Legends's official YouTube channel on the same day.
K/DA launched their official Twitter and Instagram account on August 20. Simultaneously, Riot Games revealed the single image of the K/DA logo, including the comeback's date and the titled of their pre-release song with the phrase "YOUTUBE PREMIERE 8.27.2020 12 PM PT #KDA #CALLINGALLBLADES #KDAISBACK #COMEBACK #THEBADDEST". Starting August 24, 2020, K/DA individual images with new appearance and member introduction were released from Ahri the Queen, Evelynn the Diva, Kai’Sa the Dancer to Akali the Rebel. Ahead of its release, League of Legends' Shazam page revealed Wolftyla and Bea Miller would take over the roles of Kai’Sa and Evelynn; original artists Jaira Burns and Madison Beer reprised their roles in later K/DA songs.