Half-Life 2: Episode One

Half-Life 2: Episode One
Developers: Valve, EA UK (PS3) Publishers: Valve, CyberFront (JP) Platforms: Windows, Xbox 360, PlayStation 3, Mac OS X, Linux Released in JP: June 2, 2006 Released in US: June 1, 2006, May 26, 2010 (Mac OS X), June 27, 2013 (Linux) Released in EU: June 2, 2006, May 26, 2010 (Mac OS X) This game has unused areas. This game has unused graphics. This game has unused models. This game has unused items. This game has unused sounds.

To do: The map wasteland_test.bsp was included in a May 2013 update, but later removed.

Originally titled Half-Life 2: Aftermath, Half-Life 2: Episode One is the follow up to the original Half-Life 2, featuring pretty-looking HDR effects, more cooperation with Alyx, more physics puzzles, and red skies o' doom.

As of 16 November 2024, Half-Life 2: Episode One has been merged into base HL2 as part of the 20th Anniversary update, with its Steam store listing now removed.

Unused Map

ep1_citadel_00_demo is, judging by its filename, a version of the starting map made for a demo version. The released game does not have a demo available. Loading the map via developer console causes the game to crash, and decompiling the .bsp file via programs like BSPSource spits out errors. This map was accidentally released to the game with the SteamPipe update.

Vortex Hopwire Grenade

This "weapon", also nicknamed the Black Hole Grenade, can be spawned through the console. It is very powerful, drawing everything nearby into it before collapsing and killing enemies instantly. However, it is glitchy and has an unfinished model; as it re-uses the Rollermine model as its worldmodel and the Frag Grenade's viewmodel. According to Episode Two's commentary track, this would later become the Magnusson Device.

If used too close to Alyx, it can kill her and spawn endless ragdoll copies, and often crashes the game to desktop. Later in few updates, code and scripts for this weapon were removed, however, it can still be spawned via console commands in Portal.

Unused Textures

Early blue Vortigaunt texture

This is (presumably) an early texture for the vortigaunts seen in the intro.

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Chapter 6

This GUI texture is for a cut 6th chapter. It shows Alyx hanging on from a metal railing from a train, something that can be seen in the Episode 2 teaser found in the game files.

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squashed parts.vtf

Found in materials\models\antlion_grub, this is an early version of the grub's squashed parts. Note that it doesn't have an underscore, despite being 2 words (squashed parts).

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vortring

A sprite for the vortigaunt ring.

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sky_day03_06c

An alternate variant of the skybox used in d3_breen_01 from Half-Life 2.

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sky_ep01_01

A daytime skybox with the red ring seen in the other skyboxes. Its use is unknown, though.

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Antlion Guard

Two Antlion Guard textures can be found within Episode One's files. These textures give the Antlion Guard a blue-ish colour. These could be early versions of the Antlion Guardian's textures from Episode Two.

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  Body.

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  Legs.

Combine Monitors

Various temporary textures of Combine Monitors can be found in materials\effects. These consist of photos of the main characters. Gordon's picture seems to be taken from concept art.

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  A human skeleton and what looks to be a computer chip.

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  Eli.

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  Alyx, Gordon and a random rebel.

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  Same as before, but Alyx's picture is replaced with a picture of Judith Mossman.

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  Mossman.

Unused Model

models/props_outland/pumpkin01_explosive.mdl contains an untextured pumpkin from an early build of Episode Two.

Unused Dialogue

To do: Add citizen voice lines correlating to Alyx's voicelines about greeting citizens. Alyx voice lines for a scrapped sequence involving Alyx operating a powerbox.

G-Man

There are various soundscripts located in Half-Life 2: Episode One that are pre-loaded, but whose respective sound files were omitted in versions after the preload release. The G-Man is one example of this. Here are various lines from the intro, and his only appearance in the game since the Vortigaunts hinder him from getting to talk to Gordon. Seemingly, he was to speak with Gordon in early revisions before being cut off, whereas in the final he is instead stopped from even initiating conversation.

Sound File	Dialogue
	Oh no, Freeman, come back. Come back here, now.
	Get back here.
	laughter
	Oh! Not for long.
	Not this time.
	Snarling
	Well...well shit.
	So nice to have you with us, Mr. Freeman.
	Get back where you belong, and forget about all this until-
	We meet-
	Again.
	Again.

Alyx

Sound File	Transcript	Notes
	"Unlike the fucking soldiers who volunteer for what they get.	Alyx has a small number of unused pieces of dialogue involving the Stalker train that she and Gordon ride to get out of the Citadel, where she expresses fear for the Stalkers. As Bill Fletcher mentions in the developer commentary, her reactions to the Stalkers went through a number of iterations. In very early versions, Alyx was frightened by the Stalkers. This didn't work since it clashed with her earlier reactions to Stalkers in the Citadel. In the second revision, Alyx expressed anger at the Stalkers' predicament. Fletcher mentions early versions of this new idea didn't work out since Alyx's transition from generally upbeat to blind rage was too sudden. Ultimately, through "rewrites and rigorous testing", the team found the right tone for the scene - a simmering anger level that was more in tune with the situation.
	"Here. Get yourself patched up."	These lines show Alyx was (presumably) meant to give medkits to the player.
	"Here, have a medkit."
	"Oooookay."	These voice lines were meant to be responses to the unused citizen voicelines. The only one used is al_greet_cit16.wav for a scripted sequence.
	"Uh, right... Can we keep moving please?"	Ditto.
	"Aren't you gonna speak up for me, Gordon?"
	"Not if we don't get moving, come on!"
	"Well, it doesn't look good. But Gordon here has worked miracles before."
	"Uhhh... I hate to spoil a reunion, but we really have to get moving."
	"Not for much longer if we don't get outta here."
	"I sure am! (laughs) Let's go."
	"Yeah, and that's Dr. Freeman in the suit."
	"And you probably know we gotta get going."
	"And trouble's right behind me."
	"We'll... help however we can."
	"Yep."
	"We stayed behind to get you moving, come on!"
	"I'm the person who's telling you to get moving!"
	"Ummm... Yeah, right. Let's go!"
	"He'll be here later."
	"A better question is: Why aren't you at the trains yet? Huh? Let's get moving."
	"We didn't make it yet, come on!"
	"Gordon's... a man of few words."
	"Gordon's free to say whatever he wants. ...Gordon?"
	"Say again? Never mind, let's move."

Barney Calhoun

Sound File	Dialogue	Notes
	The best thing you can do is run defense.	Barney was originally meant to say these lines when Alyx and Gordon meet up with him at a Resistance safehouse in the Urban Flight chapter.
	Ammo's in short supply; a lot of the citizens are unarmed at this point.
	Okay then. You take care of yourselves. I'll see you out there.	Barney was meant to say this when Alyx and Gordon are about to leave the Resistance safehouse.
	Dr. K's in fine fettle, isn't he?	Barney was supposed to comment on either Alyx or Gordon about Isaac Kleiner's condition either during the Urban Flight or Exit 17 chapters.
	Oh, you're kidding me. A Strider? In here?	Meant to be used for a Combine Strider battle in the first section of the Exit 17 chapter.
	Okay, where the hell did that strider come from? I thought they'd all hightailed it out of town by now.
	Hey, see if you can bring that strider to its knees, buddy.
	Good job knee-capping that strider!
	Are you crazy? Er, well, don't answer that.	Barney was supposed to say this if Gordon was to interact with him when under fire with a tough enemy entity during the first section of the Exit 17 chapter.
	A gunship! Well this is one hell of a wrinkle.	Lines for a Combine Gunship battle in the Exit 17 chapter.
	That's one less gunship in the world!
	Okay, we've gotta take out that armored personnel carrier or no one will be able to get through.	Barney was supposed to say this when encountering a Combine A.P.C. during the Exit 17 chapter.
	Oh hell, it looks like that soldier found himself a rocket launcher.	Barney was supposed to say this when spotting an Overwatch Soldier equipping a Rocket Propelled Grenade. In-game no Combine Soldier is wielding an RPG.
	Oh well...I don't have a trophy room anyway.	Barney was to say this if Gordon managed to defeat a tough hostile entity during the Exit 17 chapter.
	Good. Now, to catch up on those beating quotas.