A long time prior to 3999, the Wirrn attacked many worlds in the Andromeda Galaxy, including the Phylox system, Coscos, Salostopus, Golos and Vysp. They departed for the nearest galaxy, but returned home after their invasion attempt there failed. (PROSE: Placebo Effect) Mavic Chen, Guardian of the Solar System, attended the Intergalactic Conference of Andromeda some time prior to 4000. Planktus of the Outer Galaxies also attended. (TV: The Daleks' Master Plan)