Randall Flagg has appeared in King's novels.
Randall Flagg is a fictional character created by Stephen King . Flagg was a primary antagonist in King 's epic series , The Dark Tower , who tries to keep protagonist Roland Deschain from reaching the Tower ( the linchpin of existence ) so he can claim it for himself and become a god . Aside from King 's novels , Flagg was featured in a television miniseries adaptation of The Stand ( played by Jamey Sheridan ) and the upcoming Dark Tower film adaptation ( played by Matthew McConaughey ) .