Lukran Peabody was a Human.
The interbreeding of humans caused birth defects and many other problems. When Professor Peabody came up with apure 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 stopped the Pyxian and brought Lukran back to his mother. (PROSE: Stranger On The Train)