S1·E13 Rhapsody in Blue

Moya responds to a distress call from another pregnant Leviathan. On arrival at a planet they are contacted by a Delvian who informs them that the distress call was a deception. It was her way a getting Moya to come to them. The Delvians have a hidden agenda though. They want to forcefully take Zhaan's knowledge and learn how she overcame her insanity.