Each season of Babylon 5 has its own title. The title for season three is “Point of No Return.” (edit) They decide to destroy the jumpgate in the Markab sector because all the Markabs died in Season 2 ("Confessions and Lamentations") and raiders have used the gate to pillage the place. Also, this is the first time they actually managed to destroy a shadow vessel. (edit) The ship given to Captain Sheridan by the Minbari is the White Star. This is symmetry with the Minbari ship he destroyed in the Earth-Minbari War, the Black Star. (edit)

Marcus: Her name is the White Star, and she is yours, Captain. (edit) Endawi: This is quiet irregular Mr. Garibaldi. I was assured that Captain Sheridan or Commander Ivanova would be available.
Garibaldi: They got called away on urgend business.
Endawi: What kind of business.
Garibaldi: I'm not authorized for that kind of information.
Endawi: But you're the head of security.
Garibaldi: And what kind of head of security would I be if I let people like me know things that I'm not supposed to know? I know what I know because I have to know it and if I don't have to know it, I don't tell me and I don't let anyone else tell me either. (edit) Delenn: There are beings in the universe billions of years older than any of our races. They walked among the stars like giants, vast, timeless. They created great empires, taught the new races, explored beyond the rim. The oldest of the ancients are the Shadows. We have no other name for them. (edit) Dr. Franklin: Well, then, I have a question. I mean, granted, I am stuck in MedLab most of the time, and granted, I'm usually the last one to know anything around here, and granted, we've all been pretty busy lately, but could someone please tell me what the hell these Shadows are? (edit) Senator: Not that I can see. The ship is a complete mystery to all of them.
Morden: Good. My associates will be very happy to hear that. There's no need to rush things. Your government can dismiss this as an isolated incident.
Psi Cop: I don't know. There's something about this idea of a threat to planetary security I find very appealing. As long as we keep the real truth to ourselves, there's no reason we can't use this situation to speed up the program here at home. (edit) Delenn: They missed!? They never miss! (edit) G'Kar: They came to our world over a thousand of your years ago, long before we went to the stars ourselves. They set up a base in one of our southern continents. They took little interest in us. G'Quan believed they were engaged in a war far outside our own world.
David Endawi: G'Quan?
G'Kar: One of our greatest spiritual leaders. The book of G'Quan is copied by hand from the original with every note and line precisely drawn. This ship and your ship are the same. I tried to warn the others that the ancient enemy was returning, but no one listened. Perhaps now they will.
David Endawi: But if this is correct, why would they just disappear for a thousand years?
G'Kar: To all things there is a time, Mr. Endawi. Perhaps this is theirs. (edit) Garibaldi: I'm not authorized for that kind of information.
David Endawi: But you are the head of security.
Garibaldi: Then what kind of head of security would I be if I let people like me know things that I'm not supposed to know? I know what I know because I have to know it. And if I don't have to know it, I don't tell me, and I don't let anyone else tell me either. Now look, we have tried most of the other ambassadors, why don't you speak to G'Kar, maybe he knows something about this ship.
David Endawi: Under the terms of our recent treaty, I am not authorized to have any official conversation with the Narn without Centauri approval.
Garibaldi: So you'll ask unofficially. And I can give you reasonable assurances that the head of security will not report you for doing so.
David Endawi: Because you won't tell yourself about it?
Garibaldi: That's right. I never get involved with my own life. It's too much trouble.
David Endawi: This is a very strange place you have here, Mr. Garibaldi.
Garibaldi: Thank you. (edit) Londo: What guarantee do we have that your forces do not decide to turn around and attack us?
Morden: None. Ambassador, we both know what promises and treaties mean. All I can say is that we have what we want. The rest is no concern to us. (edit) Sheridan: We've spent too much time reacting when we should have been acting. Let's take the offensive for a change. Fire up the shuttle, Commander, we've got work to do. (edit) Garibaldi: I thought the Rangers will be trained on Minbar.
Lennier: Many of them are, yes. But there is a wisdom in, as you say, not putting all of your eggs in one basket. (edit) Sheridan: I haven't had chance to fill you in on everything until now. And I apologize for that. But from what I've just heard we don't have a lot of time. This is Marcus, he's a--
Ivanova: A Ranger. They've been trained to fight the Shadows and keep an eye on what is happening outside Babylon 5. The Rangers in this area are in the direct control of you, Ambassador Delenn, and Garibaldi is functioning as your liaison. Did I leave anything out?
Sheridan: When did you..? How did you..?
Ivanova: Captain, the day something happens around here and I don't know about it, worry. (edit) David Endawi: Can you tell me if you have seen this before?
Londo: Yes. In a dream.
David Endawi: In a dream?
Londo: I'm standing .. somewhere, on Centauri Prime, I think. And I am .. looking up. And there are ships, just like this, passing .. overhead. First a few, and then more, a thousand, two thousand, so many that they blot out the sun. Terrible sight, terrible.
David Endawi: That's all?
Londo: It is enough. .. No, that's all I know. (edit) Delenn: These ships, once they target you, they never stop, never slow down, never give up, until they have destroyed you. They are nearly invincible.
Sheridan: I don't believe that. Every ship has a weakness.
Delenn: Believe what you will, then experience changes your mind. Take a good look, John, and remember it well. That is the face of our enemy. (edit) David Endawi: It's hard to gauge size in hyperspace, but it's big and it's powerful, and it's totally unknown to us. It attacked and killed one of our pilots. It's clearly from a highly-advanced civilization. We are down-playing this at home, trying to convince the public we know what it is, where it's from and that we are not worried. We don't have a clue. (edit) Londo: We have danced our last little dance, Mr. Morden. Now it is time for you to go away. (edit) Sheridan: You know, I'm getting little tired of these unannounced visits by VIPs who will not tell us why they are coming or what they are going to do when they get here.
Ivanova: I'll leave it to you to try take all the fun out of life. I mean, come on, where's your sense of mystery, adventure?
Sheridan: Are you trying to cheer me up?
Ivanova: No, sir. Wouldn't dream of it.
Sheridan: Good. I hate being cheered up. It's depressing.
Ivanova: Well, in that case, we all are going to die horrible, painful, bleeding deaths.
Sheridan: Thank you, I feel so much better now. (edit) Ivanova: The Babylon project was our last, best hope for peace. .. It failed. .. But in the year of the Shadow war it became something greater: our last, best hope .. for victory. The year is 2260, the place: Babylon 5. (edit) Sheridan: You know, I just had a thought. You've been back and forth to your homeworld so many times since you got here, how do I know you are the same Vorlon? Inside that encounter-suit you could be anyone.
Kosh: I have always been here.
Sheridan: Oh yeah, you said that about me too.
Kosh: Yes.
Sheridan: I really hate it when you do that.
Kosh: Good. (edit) Sheridan: Ambassador. I've been looking for you. Last week, after you saved my life, I didn't really get a chance to thank you properly. I've tried to reach you since then, but .. you haven't answered my calls. Is everything all right?
Kosh: Being seen by so many at once was a great strain. I returned to my ship to rest. You have a question?
Sheridan: Nobody knows it was you. Everyone saw something .. different, something from the legends of their own world. But it was still a terrible risk. After taking such .. such care to hide what you really are, why take that chance?
Kosh: It was necessary.
Sheridan: Well, as answers go, short to the point, utterly useless and totally consistent, what I've come to expect from a Vorlon.
Kosh: Good. (edit)

From whom did Marcus get his fighting pike?
Could it be Ambassador Sinclair? And if so, where did Sinclair get it from?

Marcus did mention to have been trained by Durhan in "Grey 17 Is Missing", but that could have been a braggarts claim to psyche out Neroon..

Or perhaps he would hide that he maybe were trained by Sinclair?

(edit) Revealing Mistakes: In the opening shot there is an effects problem. After the repair crew is shown watch the stationary ring around the station. At at eight o'clock position there is a small shaded area the bottom of which flickers. (edit)

This episode does not have any allusions. Add some now!