Reports of unexplained lights in the sky have appeared throughout history and from all over the globe. This episode of Invasion Earth starts on the East Coast of the US in 1965 following a reported crash landing, before moving to Europe to examine a strange light streaking across the skies of Spain and Portugal as recently as 2004. Finally we return to the 1960s, but this time to delve into a Southeast Asian UFO mystery in war-torn Vietnam. One man tells of his disturbing experience of a mysterious light appearing over a military base, which seems to knock out the camp's electricity.