World War V was an Earth conflict in which the Doctor was present. (TV: The Unquiet Dead, AUDIO: Singularity, The Gathering) According to one account, the war was fought in the 49th century. (AUDIO: Singularity) According to another account, in the 37th century, the war was described by Cazkelf as "Earth's recent history". (COMIC: Art Attack) During the conflict, much of Earth's art treasures were destroyed, though these did not include the Mona Lisa. (COMIC: Art Attack)