Return of the Killer A's is a best of compilation album by the heavy metal band Anthrax, released in 1999.
The cover of "Ball of Confusion" features Anthrax's first new recording with former lead singer Joey Belladonna since 1991, and their first with former bassist Dan Lilker since 1984. Neither one would stay with the band past that song's recording, though a tour featuring both Belladonna and then-current Anthrax singer John Bush was in the works at one point. The song is also notable because it features both Belladonna and Bush on vocals.
The album culled at least one song from all but one studio album up to the release. (No tracks from the debut album Fistful of Metal is included, although in some editions, the track "Metal Thrashing Mad" from the said album is included.) Also included is the track taken from two EPs and "Bring the Noise", collaboration between Anthrax and Public Enemy previously released on Attack of the Killer B's, the compilation of B-sides. Two singles were released off the album:
"Crush" was released as a single off the album, appearing only with the song itself, on which it says "From the Beyond Music release Return of the Killer A's - The Best of Anthrax.
"Ball of Confusion" was released as a single also, having the album version of the song, along with the edit.