Vox 1: Invasion is a Keen 1 mod by Grelphy. It is the first episode of the abandoned Vox trilogy. The story of the series is set after Mortimer's defeat in The Universe is Toast. As Keen's nemesis fails to accept his defeat, he makes up a new plot to destroy the universe and creates genetically engineered super beings called the Voxians. In the first episode, Keen receives a distress call from Fribbulus Xax. When the protagonist arrives in the Xax system, he is confronted with a fleet of Voxian ships. Keen sneaks into the command ship, where he has to destroy four key systems to disable it and learn about its origin.
Vox was first announced by Grelphy in late 2003 and planned to be released in mid-2005, which did not happen. The mods were eventually abandoned, but the author made the beta versions of the nearly finished trilogy available to the public in July 2008.