Lukran Peabody was a human.
The interbreeding of humans caused birth defects and many other problems. When Professor Peabody came up with apure[statement unclear] human DNA she gave it to her son to be the first in a new line. However the Pyxians also wanted the DNA. They kidnapped Lukran. K9 Mark 2 stopped the Pyxian and brought Lukran back to his mother. (PROSE: Stranger On The Train)