Geordi's friend and former shipmate, Susanna Leijten, informs him that the two of them are the only crew members remaining from an Away Team that once investigated the mysterious disappearance of several people on the planet Tarchannen. The last of their former colleagues has stolen a shuttlecraft to head back to the planet, and Susanna enlists the U.S.S. Enterprise's aid to find out what is happening. The starship follows the shuttlecraft to the planet discovering two additional shuttlecrafts on the surface, but no life signs. After Geordi finds two torn Starfleet uniforms, Susanna tells him she senses the presence of the others and heads off into the darkness. When Geordi tries to stop her, she begins thrashing like a wild animal. He has her beamed to Sickbay.
