Invasion earth brings extraordinary and baffling cases of unidentified flying objects to life through powerful eyewitness testimony, graphics, drama reconstruction and original archive. In Kaikoura, New Zealand strange lights are witnessed by pilots and confirmed on radar. The story turns global when a film crew capture the phenomena on film and the Government is forced to investigate. Deep in the jungle of Vietnam a group of US paratroopers have an extraordinary encounter. A bright light rises up from the forest floor and disappears into space. Both American and Viet Cong soldiers are terrified and the following day the paratroopers find the enemy have fled. And hundreds of UFO sightings sweep across the UK. The mysterious spheres of fire are caught on camera and one nearly collides with a police helicopter. Finally, one young couple come forward claiming to be responsible.