Mardola is the main antagonist of the Stargate Atlantis episode "Harmony". She was portrayed by Crystal Lowe.
Mardola is the older sister to Harmony. In 2008, she requested Lt. Colonel John Sheppard and Dr. Rodney McKay to escort Harmony to the Ruins of Larris, as she was lined up to become queen after their mother passed away. But Mardola was secretly employing the Genii to capture Harmony, as she believed Harmony was too young to be queen. After they escaped and returned to the castle, they discovered a Genii communicator in her quarters. Harmony then banished her to jail until she would be "Too old to remember".