Robotech
Metal Fire
S1 E45:
Failing in their attempts at capturing the humans who entered their ship, the Robotech Masters plot to raid a nearby city and capture as many humans as they can in order to experiment and see if they should fear this minor group of creatures calling themselves earthlings, or if they should continue to concentrate on recovering their precious protoculture before the Invid, the mortal enemies of the Robotech Masters, come looking for their next meal of protoculture matrix - something they call "the flower of life."