The Light of Zartha is a special cosmic force that Zarthan princess Lauranna left on her visit to Earth. The Light was left at a safe place that the evil Serleena wanted to use to destroy Zartha. However, Serleena killed Lauranna, and Kay told Serleena that it was in a rocket leaving the Earth which Serleena chased for many years. During the events of Men in Black II, Serleena returns and targets Laura, Lauranna's daughter. It is originally thought to be Laura's bracelet, but in the end, it turns out Laura is the Light, who is sent on a ship to save her planet.