Sheridan is brought around to face Londo, and Sheridan insists that what he sees on Centauri Prime couldn't happen. He demands to know what year it is, and Londo tells him it is the last year, day, and hour of Sheridan's life - seventeen years after he began the war against the Shadows. Londo tells the guards that he is tired, and wants Sheridan taken back to his cell. Londo promises Sheridan he will meet whatever God he worships when next they meet, and Sheridan is taken away.
On Babylon 4, Major Krantz arrives on C&C to find that there is still another hour or hour and a half until the sensors are back online following the explosion. He says that he wants search teams increased so that they are prepared in case anyone tries to breach the hull.
Even though Sheridan is alone in his cell back on Centauri Prime, without his time stabilizer, he is still unstuck in time, and reappears briefly upon Babylon 4, noticed only by Zathras, as he reaches, in pain, for a time stabilizer. Meanwhile, Sinclair and Delenn prepare to set up their equipment, but the room in question is currently occupied by a group of officers. Delenn is then overtaken by a strange feeling, which she describes as someone walking over her grave.
Ivanova finishes her tampering, and the computer announces a hull breach in the area. The pressure doors fall down behind the evacuating crewmembers, leaving Sinclair, Ivanova, Delenn, and Marcus to do what they need to until the station personnel manage to burn through the door.
Sheridan tells Delenn in the future that he isn't really there, and that he isn't supposed to be - he tells her that the last thing he remembers was his time stabilizer being hit. She believes him, and remembers that he had told her, a long time ago, that he had seen this moment in their future. She tells him that there is much pain and grief ahead of him, and that she sees in his eyes an innocence he lost long ago. Delenn tells him that the war against the darkness can never truly be won, but that they've created something that will endure for a thousand years, that they succeeded at everything they set out to do, but at a terrible price. Sheridan asks if there is anything he can do, but Delenn knows the only way to change this future is to surrender to the Shadows - a price too high to pay. The guards arrive again, and it is time for them to leave.
As Sheridan and Delenn move toward the ship, Sheridan lurches suddenly, and knows he's being pulled back again. But, before he goes, Delenn gives him words to take with him back to the past. "Treasure the moments you have. Savor them for as long as you can, for they will never come back again. John, listen to me. Do not go to Z'ha'dum. Do you understand? Do not go to Z'ha'dum!" Upon hearing these last words, he falls to the floor, and is pulled away in time.
Sinclair and Sheridan are nearly done placing the homing device in the power core, while Ivanova reports to them that she has rigged the scanners to make it look like the station is about to explode. C&C discovers this, but Major Krantz insists that they increase the output to the power core, despite its not having been tested. The sudden increase throws Sinclair and Sheridan away from the station just as the surge of tachyon particles increases, and Babylon 4 begins its journey through time.
Zathras understands the problem, but insists it isn't his fault. He is able to stop the station's movement through time, but not before Sheridan becomes unstuck in time yet again. Zathras tells them that the time device placed in the core activated prematurely, sending them four years into the future, to when Babylon 4 reappeared before. Zathras says they can't do anything else until they adjust the time system. Ivanova tries to contact Sheridan, but Sinclair reports that he has gone again, and that they have a slight problem.
On C&C, the first officer convinces Major Krantz that, despite all their work, it is necessary to evacuate to protect the lives of those on the station. Krantz reluctantly agrees and orders a distress signal to be sent out. Just as they are sending it, though, another increase of tachyon particles hits the station, and Delenn...
...just as she finds herself again aboard Babylon 4. Zathras explains what she experienced was a timeflash, where one sees oneself forward or backward in time, due to the instability of the system. Sinclair arrives, but he isn't quite the Sinclair they knew - he now appears much older. He explains that, when he and Garibaldi went to Babylon 4 previously, they were exposed to the time field without any protection. He didn't want Garibaldi along because he knew that Garibaldi, too, would have something similar happen to him if they should be exposed to it again. Sinclair says they need to finish their job, and that they need to get Sheridan back. Zathras says he can fix the time stabilizer, but needs equipment. Ivanova and Zathras leave to try to find the equipment elsewhere on the station. Sinclair says he is going back to the core to readjust the equipment, and tells Marcus and the rest to stay with the White Star and monitor the readings.
While Zathras searches through some equipment to find the tools he needs to repair the the time stabilizer, Lennier reports to Sinclair that seven ships are approaching the station - one of which contains Garibaldi and another Sinclair. Zathras finally finds what he needs to repair the time stabilizer, and finishes just as he is discovered by several security guards who level their PPGs at him.
While Major Krantz brings the other Sinclair and Garibaldi onto the station, explaining to them what happened aboard the station before it was brought forward in time, Delenn arrives back in the station from the White Star and sees Sheridan, still in his space suit, reappear.
Krantz introduces the other Sinclair and Garibaldi to Zathras, who looks up at Sinclair, and says, "Not the One." This confuses Sinclair, but Zathras won't say anything else to him, and claims merely that he does what he is told.
Zathras tells Sinclair and Garibaldi that they need Babylon 4 for a great war, as a place to gather to fight and organize, to help save the galaxy "on the side of Light." Zathras explains further, saying that, without the station, it is the end of everything. "The One leads us. The One tells us to go, we go."
Two security guards arrive in the corridor to find a figure in a blue space suit, appearing and disappearing. The guards run and tell Major Krantz, and everyone leaves the room where Zathras was being questioned, including Zathras. They find the figure in the space suit, which Zathras identifies as being the One. The figure in the space suit apparently is having difficulty standing, and Sinclair begins approaching it.
Ivanova finishes what she is doing, and warns Sinclair, who has finished readjusting the homing device in the core, to back off, as it will soon become operational.
The other Sinclair approaches the blue-suited figure and touches its outstretched hand, but is thrown back by a large blast. In the resulting commotion, Zathras runs to the figure and gives it the repaired time stabilizer, warning the figure to take it and leave quickly. The figure vanishes.
Ivanova activates the station, and it begins moving. Zathras warns the others to leave quickly, or else be trapped there forever. As Sinclair moves away from the power core, Marcus discovers Sheridan, once again on Babylon 4, with a new time stabilizer. Sheridan says that someone must have put it on him and switched places. This confuses Marcus, who doesn't know who has been running around Babylon 4 in the blue suit.
The other Sinclair and Garibaldi, while trying to escape with Zathras, lose him as he becomes trapped under a fallen pipe. Though Sinclair tries to save Zathras, Zathras insists that he leave, telling him that he has a destiny. Sinclair, though clearly confused, does as he is told, leaving Zathras behind.
As the ships carrying the Babylon 4 crew and the other Sinclair and Garibaldi leave the station, Sinclair, just leaving the station's core, stands on the outside of the station and activates his communicator, to try to deliver one last message. "Babylon 4 to Garibaldi, Babylon 4 to shuttle one. Garibaldi, do you read me? Watch your back, Michael. Watch your back." But the target is outside of communication range. Sinclair moves toward the airlock, just as Babylon 4 begins to vanish one final time.
Sinclair, inside the airlock, removes the headpiece from his own space suit. "I tried," he says. "I tried to warn them. But it all happened... just the way I remember it."
"I know," Delenn tells him. "It's time. We have to go. They're waiting for us." Delenn, and a morose Sinclair, leave to join the others.
Sinclair and Delenn arrive on C&C, and Ivanova says that the time-shifting controls can now be controlled from C&C. Sinclair says he will set them off by himself and then return to the White Star, but Marcus doesn't believe it. He knows that the system isn't fully automatic, and that someone has to ride Babylon 4 back into the past. Though he offers to do so, Sinclair won't allow it. "I'll take it back because I've always taken it, and I always will. It's already happened."
"You don't know that," Ivanova protests.
"Whose handwriting is this?" he asks.
"Mine," Sinclair explains. "I wrote this from the past... nine hundred years ago. I went. It's as simple as that."
"He's telling the truth," Delenn says. "I received one as well."
"No," Ivanova insists, "I can't accept this."
"If I go back to our time, the aging effect will probably kill me. Isn't it better to choose life?"
"Damn it, Jeff, I..."
"Susan, it's all right. My whole life has been leading to this," Sinclair tells her. He asks her and Marcus to leave them for a moment, so they can discuss something alone. After they have gone, Sinclair asks Zathras why he pointed to Delenn when he said he followed the One.
Sheridan sits down in the captain's chair, and though it is clear that everyone will miss Sinclair, Sheridan says they need to leave and respect Sinclair's wishes. They break the docking seal, set the engines to maximum, and head back home.
The White Star emerges from the temporal rift, which closes behind it, Sheridan assumes, to make sure no one else is trapped there. "That door is closed forever," Delenn tells him. "And it is not the only one. Lennier told you that a thousand years ago, human and Minbari souls began to merge - Minbari souls were being born in human bodies. Something happened that opened that door between us. My change was, in part, to even the scales and restore balance between our races, using a device my people discovered a thousand years ago. You see... if my people had found Babylon 4 with a human aboard, they would never have accepted it."
Marcus instantly knows what this means. "Dear God... 'A Minbari not born of Minbari.'"
A thousand years earlier, two Minbari ships arrived at Babylon 4, to be met by Zathras. "Good. Good," he told the two Minbari that came aboard. "Zathras knew you would come. This way." He ushered them further into the station.
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