In a Fantastic Voyage, more often than not, the voyagers will have to contend with white blood cells that are instinctively trying to remove them from the bloodstream. (Hey, the white blood cells don't know the voyagers are there to help!) Either the voyagers will meet them head on and attack, or a Chase Scene will ensue. White blood cells usually don't chase pathogens, they just float around and eat any threats that they bump into. Examples of Seeker White Blood Cells include: