expansion MOD:Mission to Sleheyron: A New Story Expansion Mod for KOTOR

[SAO1138]

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Mission to Sleheyron: A New Story Expansion Mod for KOTOR

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Introducing: Mission to Sleheyron... A brand new planet expansion to add to your next KOTOR play-through: Sleheyron!

Built upon the Sleheyron demo mod by the legendary SithSpecter (with his permission), this new mod adds a huge new story that brings this lost-absent planet back to KOTOR.

I was inspired by SithSpecter’s work, and I’m hoping in the future my mod will be compatible with his. It would be a worthy venture for me to undertake to make our Sleheyron stories co-exist. After all, I owe him a HUGE debt of thanks for permitting other modders to build off his Sleheyron demo!

This new mod is my first ever mod project, and I’m quite excited to share it with you. Sleheyron will feature:
 
1: A roughly 5 hours long story, voice-acted (no AI voices either).
2: A fully-voice acted new party member, complete with a post-Sleheyron story and romance (The new companion can even do the Leviathan rescue!).
3: 25 new modules of various shapes and sizes (including the four published by SithSpecter, which are amazing and I owe him a huge thanks!)
4: New weapons and armor.
5: Lots of connections to Tales of the Jedi, as I am a big fan of those comics.

 

If you are interested in using other mods, please install them in this order. If you aren't using a certain one, go ahead and skip it.

1. K1 Community Patch
2. K1 Restored Content Mod
3. The K1 Restored Content Mod-Community Patch
4. Sleheyron Base Install
5. BOSSR
6. Sleheyron-BOSSR Compatch
7. Sleheyron-K1CP Compatch

 

The story for Mission to Sleheyron starts shortly after the player gets their main mission from the Jedi Council on Dantooine. There is a save file in this mod that will allow players to skip right to that moment with a pre-built character. Then you just need to fly to Sleheyron... But I also encourage players to make their own characters, too!

Sleheyron can be visited at any time between Dantooine and the Unknown World. I, of course, recommend going early to enjoy the new companion as long as you would like.

 

And when you're done with the main story on Sleheyron... Perhaps you're up for another challenge?

Introducing the new minigame: The Arena of the Glorious Jewel! Following the events of the main Sleheyron storyline, return to Sleheyron for some of the hardest KOTOR combat you've ever seen! Jump into the arena- with your Hutt sponsorship behind you- and endure as much as you can of INFINITE waves of the worst machines, mercenaries, and monsters the KOTOR games have to offer! The waves keep getting more difficult, and you'll win 100 credits per wave. You can choose to resign whenever you want with your winnings... But surely you want a chance to see if you're the greatest Knight of the Old Republic ever?

Some acknowledgements!
 
Modders:
Of all the people I need to thank, there are three above all others:
First and foremost, the absolute biggest thanks to SithSpecter: Not just for creating the Sleheyron Demo that this mod is built off of, but for granting permission to use that Demo. When the day comes your Sleheyron Restoration Mod is complete, I know that it will be the very best Sleheyron mod out there!

And right after SithSpecter is my good friend, The_Chaser_One. Chaser has been an extremely great friend (and a talented KOTOR modder himself) and is responsible for making this mod compatible. He's talked through many ideas, he was the best beta tester anyone could ask for, and he really did work hard to make this project a better one to share with all of you. Thank you for your help, Chaser- really!

And lastly, one new acknowledgement: My good friend "FTD." Despite the fact he was totally new to modding, he not only is responsible for making this mod Mac-compatible, but also having made this mod EXTREMELY optimized! So many glitches have been fixed! And the mod runs better and is more lightweight than ever. Thank you, FTD! 

 

Others to thank:
 
Thor110, for helping me out with the basics of module design, as well as introduced me to some cut modules to use.
DarthParametric, for teaching me to retexture NPCs as well as two "larger creature" mods that became resources for Sleheyron (is there a single KOTOR mod out there that he hasn't been credited on?).
SithHolocron, who early on helped teach me how to retexture modules.
ZobiZob, for amazing YouTube tutorials for how to use Holocron Toolset and solving my problem with playing movies, as well as helping out in getting a Sullustan model from KOTOR 2 to work on Sleheyron, and a glowing goo pile model... and really so much more, really!
GlaspyLawson, who learned modding at the same time as me, and shared his knowledge; and for contributing a side quest to Sleheyron!
JC for just answering so many of my questions through the entire modding process.
Really, the whole Mod Development KOTOR Discord Group! Thank you for either offering advice or tolerating my simplistic questions!
 
Testers:
Mikael, the absolute most enthusiastic alpha tester anyone could ask for.
StellarExile, who helped me out with learning how to use the patcher.
MistahJayGarrick for his high praise of the story content (and occasional blunt, but necessary, advice).
 
Tool Developers: 
Cortisol and Th3W1zard1 designed and kept updated the incredible Holocron Toolset, that was instrumental in this mod's design. I owe them a massive thanks for their work, and the hours they spent helping me out with bug-fixing! And also Wizard for a pretty fun voice, too. 
 
Voice cast:
LadyWarden, the talented actress that gave us the incredible voice of Vima; giving this long-standing fan-favorite character a perfectly excellent rendition (she was also an excellent audio assistant and helped design the load screens).

 
Mikael, for various voiceovers around Sleheyron that made the planet feel alive (including the dulcet tones of an exhausted Hutt).
C4 for the excellent performance as Commander Forcay, praised by a tester as "Sounds exactly like an NPC from KOTOR!"
PuckShadows for his Sith Lt. Savage.
Juice Phanta for a pitch-perfect protocol droid.
Black Rose for literally hundreds of Iridorian mercenary lines, giving me an impressively huge range of pitches to work with.
Schofield-HD for an officer of vice and virtue, as well as a few Sith troops.
Gwoopp and MerakiSky for two fun little roles in the Sleheyron cantina.
 
Companies:
Of course, BioWare and Lucasfilm, for making this game that we all enjoy so much.
NexusMods and Deadly Stream for being the places to discuss and host mods.
Discord for enabling communication that made this mod a collaborative effort.
 
Final Dedications: 
My wife, who tolerated me spending nearly six months isolated to make this.
To a relative who isn't around anymore to enjoy Sleheyron. I think this mod would make you proud! (even if you did spoil this game for me)

My apologies if I missed anyone else; but I appreciate all of your hard work!

I hope you all enjoy Mission to Sleheyron!

 

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• Submitter
  SAO1138
• Submitted
  06/08/2025
• Category
  Mods
• K1R Compatible
  Yes

 

Edited June 9, 2025 by SAO1138
accidentally pasted too much info

[justsomeuser2k]

Hey played through your mod the last few days and wanted to say thank you for the wonderful time!

Found a few bugs, which I thought I should bring up.

I got stuck in three places where I wasn't able to move out of the area:

Spoiler

1) Czerka Biomedical Examination Lab

going into it was fine, but going out it seemed like there was an invisible door

2) A room in Aratech Droids

there seems to be an invisible wall and I somehow glitched behind it

3) In the arena behind some scrap piles

Rodo's Mystical Antiques had some missing textures:

Spoiler

When selecting Vima while leaving the Ebon Hawk it says "I am broken so very very broken":

Spoiler

And lastly after the Leviathan when the MC reveals the "big secret" to the crew and talks to T3 there's no response and the player is trapped on the Ebon Hawk:

Spoiler

 

[RevanFan132]

Hello, would like to say loving the mod and all the content that's included, you've done an amazing job. I am playing through now but commander Forcay is glitched for me, whenever i try to start dialogue it cancels out and I'm unable to start his quest line (which I assume is the main quest line). If you would have any ideas for a way to fix this please let me know, everything else has worked fine : ).

[SAO1138]

On 9/19/2025 at 6:32 PM, RevanFan132 said:

Hello, would like to say loving the mod and all the content that's included, you've done an amazing job. I am playing through now but commander Forcay is glitched for me, whenever i try to start dialogue it cancels out and I'm unable to start his quest line (which I assume is the main quest line). If you would have any ideas for a way to fix this please let me know, everything else has worked fine : ).

Hi there. First of all: very sorry for taking so long to respond to this. I usually have discussion on the download page and I just forget to check this announcement page.

 

To your point: if you’re talking about the start of the mod, did you try talking to Vima first? And after that, did you then talk to Bogga the Hutt? That should proceed Forcay’s quest.

[The96OilBurner]

When I go to the flophouse to the small alien no text pops up to get him to sell the ithorian armor. 

[gubo]

When I go to the Sheriff that then redirects me to the cantina to progress the story and get the new party member, once I click on the dialogue to go to the party selection screen, it crashes (CTD) and I never get to the point to select the party.