A prominent figure in the field of Geological Science, Kirby Milo became an activist in primate liberation after completing their tenure at The Hall of Dragonfly Nebula. Kirby was originally content to be stationed at the Tributary Universal Burrow performing duties to benefit the Doctors, but upon learning of the Critical Earth Expedition they decided to step away and pursue the path of activism. Now, as their mission takes them to Earth, Kirby and the Doctors seek to confront the Homo Insipiens for their failure to free their captive primates as they had promised to do so long ago.