Synopsis by Hal Erickson
Moya and her crew are lured to a Delvian Colony by a false distress call. It turns out that they have been summoned on behalf of ailing Delvian ruler Tahleen (Kate Raison), whose life can be saved only by one of her own lineage -- namely, Princess Zhaan (Virginia Hey). In her efforts to do her royal duty, Zhaan goes insane, and her madness spreads to the rest of the crew. To rescue his comrades, and to prevent Tahleen from irretrievably capturing Zhaan's soul, Crichton (Ben Browder) must participate in Unity, a dangerous Delvian ritual. "Rhapsody in Blue" first aired on July 23, 1999.