"The humans are a real enemy. An enemy I can touch, see and kill."
- – Morann
Unknown to him at the time, Sonovar - a relatively minor member of his staff - was acting as a spy; using his position and Morann's connections to Callier's inner circle to obtain intelligence that he would sell on to Londo Mollari of the Centauri Republic.
In 2245, Morann was on the Valen'Tha en route to Z'ha'dum when it encountered an Earth Alliance explorer division, lead by the EAS Prometheus. Unable to understand their language and rather than trouble Chosen One Dukhat before they could find out more, he ordered the crew to increase the scanners to maximum to get a proper fix. As the ship drew closer, Morann reported the situation to Dukhat and the other members of the council, announcing that they were approaching with gun ports open, in accordance with Warrior Caste traditions.
As Delenn spotted a group of three Soul Hunter ships, Dukhat immediately ordered the ports closed. Morann protests that there's no reason if they do nothing to provoke the Humans, but the words are barely out of his mouth before the alien ships open fire. Taken by surprise, the Minbari ships are heavily damaged in the sudden barrage and while Dukhat dies in Delenn's arms, Morann and the surviving council members quickly discuss what is to be done. Opinion is divided with half voting for restraint to find out what happened first while the others voting to exact immediate revenge. Morann finds Delenn kneeling over the body of Dukhat and tells her of the impasse, and asks her to cast the deciding vote. Furious and grief-stricken, Delenn screams at Morann that they will strike the humans down, showing no mercy.
In the beginning, Morann supported the holy war against the Humans but after much blood had been spilt, even he grew tired of war. Despite this, he believed that Minbar, "a world gone mad", could not be halted as the war had taken on a life of its own.
In the audio commentary for In the Beginning, J. Michael Straczynski and Mike Vejar divulge that in a scene in Delenn's quarters, Morann and Lenonn would have come to blows. This part of the scene was excised from the final cut of the movie.