Kruger National Park in South Africa is under attack from alien invaders. A stealthy microscopic killer, known as bovine tuberculosis, stalks the veld. But it’s true natural born killers- the pretty plants that destroy all in their path. Including the killer water lettuce that sucks the oxygen out of precious water resources. Join Kruger rangers as they combine science on the move and high tech medical techniques to fight disease and destruction wrought by invasive species.