World War VI was a brief conflict which took place in the year 5000, when the Supreme Alliance of Eastern States used the Peking Homunculus to assassinate Ingrid Bjarnsdottir, the commissioner of the Icelandic Alliance.
The Peking Homunculus was created by Dr. Sa Yy Findecker. It was presented by Magnus Greel as a gift to Commissioner Bjarnsdottir. Though it was believed to be a toy for her two children, it was actually an assassin and killed Bjarnsdottir. This sparked off a war between the Icelandic Alliance and the Supreme Alliance. (TV: The Talons of Weng-Chiang; AUDIO: The Butcher of Brisbane)
For a while, the Supreme Alliance prospered, but the war turned against them in the final battle for Reykjavik between the Alliance and the Philippines. The Doctor marched with the Filipino Army in their advance and witnessed their victory. After the conflict, Magnus Greel took the Peking Homunculus and escaped to 19th century China using an experimental time cabinet created by Dr. Findecker. (PROSE: Doctor Who and the Talons of Weng-Chiang)
The Doctor was able to prevent further bloodshed using information provided by his fifth incarnation. (AUDIO: The Butcher of Brisbane) The Seventh Doctor later remembered seeing the faces of victims during the sonic massacres in 51st century Brisbane. (PROSE: The Hollow Men)