*When Geordi La Forge was part of an away team sent to the surface of Tarchannen III, he was infected with an alien reproductive DNA strand. This strand laid dormant fo years until finally it began to take over Geordi's own DNA. As Geordi underwent the transformation into a Tarchannen alien, he began to lose his ability to reason. Fortunately, Doctor Crusher was able to restore Geordi's DNA to normal, saving his life. *Source: Back of card