A Centauri noble comes to Babylon 5 to transport an important relic in Londo's possession back to the homeworld. And a mysterious man visits all the alien ambassadors asking them an unusual question.

The Centauri are about to withdraw from a quadrant of space because the Narn are harassing them, when Londo gets an offer to take care of the problem. Meanwhile, Garibaldi tries to find out what his informant stumbled upon that got him killed.

Sheridan's sister comes to visit him at his new command, G'Kar returns with grave tidings from the rim of known space, Dr. Franklin tries to wake Gribaldi from the coma with the alien healing device obtained from Dr. Rosen, and something is happening in Delenn's quarters.

Sheridan is shocked to learn that one of the crew of the Icarus, a science ship that exploded with his wife aboard, is alive - namely Mr. Morden. A representative of the Ministry of Peace comes to the station to recruit personnel to the Nightwatch.

An Earth Force investigator comes to Babylon 5 with Lt. Keffer's last recording, asking the ambassadors if they recognize the ship in it. Meanwhile, Londo takes steps to remove himself from the Shadows, and Sheridan takes the White Star out for its first mission.

Bester comes to the station to track down a dealer of Dust - an illegal drug that gives normal people temporary telepathic powers. G'Kar is also interested in the drug. He sees it as a potential weapon against the Centauri, but first he has to test it.

Delenn prepares for a ceremony of rebirth, the station's computer goes through an interesting change, Londo "encourages" Refa to stop associating with the Shadows, and the remains of the Nightwatch on Babylon 5 plan to strike at Sheridan through Delenn.

Morden returns to secure Londo's cooperation again, Garibaldi confronts Franklin about the stims, and Kosh gives Sheridan a victory against the Shadows - but at a price.

After he has recovered from the shock of seeing her, Anna gives Sheridan an ultimatum - come to Z'ha'dum with her, or never know what happened to her there.

In the aftermath of the explosion on Z'ha'dum, Sheridan is presumed dead and Garibaldi is missing. Delenn struggles to keep the alliance against the Shadows together, and Londo takes up his new position on Centauri Prime as security advisor to the emperor.

With the Vorlons destroying whole worlds, Babylon 5 is struggling to cope with the refugees. And with one Vorlon aboard, they cannot make a move without them knowing about it, so Sheridan decides to kill him. On Centauri Prime, Cartagia explains to Londo how he will become a god when the Vorlons destroy the planet.

In the hours before the Shadows and the Vorlons meet Sheridan's alliance at Corriana 6, Ivanova and Lorien search the last of the First Ones, and Londo races back to Centauri Prime in hope of removing all Shadow influence before the Vorlon planetkiller arrives.

The Brakiri buy a part of Babylon 5 for a religious ceremony where the dead are supposed to return. Comedians Rebo and Zooty arrive to do a show on the station.