Mothership - Starter guide
What is Mothership?
Mothership is a sci-fi horror tabletop RPG designed by Sean McCoy and published by Tuesday Knight Games. You play as crew members aboard spaceships and stations in a grim, unforgiving universe where the odds are stacked against you. Think less Star Trek, more Alien or Event Horizon. The tone is tense, the stakes are high, and survival is never guaranteed. Mothership began life as a stapled zine of forty-four pages - a story we tell in our history chapter From photocopier to shelf.
This is not a game about being heroes. It's a game about people doing their best in terrible situations - and sometimes not making it.
How does the system work?
Mothership uses a percentile system: you roll two ten-sided dice and try to roll equal to or under your relevant stat. Characters have four core stats - Strength, Speed, Intellect, and Combat - alongside a set of derived saves (Body, Fear, and Sanity). Skills are tiered into Trained, Expert, and Master, and each grants a meaningful bonus to your roll.
The heart of the system is the Stress and Panic mechanic. Stress accumulates through frightening encounters, failed rolls, and the general horror of the situation. When it gets too high, characters have to make Panic checks - and if they fail, they roll on the Panic table. The results range from freezing up, to fleeing, to something much worse. It's elegant, uncomfortable, and does exactly what horror needs: it makes players feel vulnerable without taking control away entirely.
Character creation is deliberately fast. You can build a functional crew member in under ten minutes. Four classes are available - Teamster, Scientist, Android, and Marine - each with a different stat spread and skill set.
What do you need to get started?
The 1st edition of Mothership comes as a boxed set from Tuesday Knight Games. The Mothership Core Set contains:
- The Player's Survival Guide (the core rules for players)
- The Warden's Operations Manual (the game master's guide to preparing and running sessions and campaigns)
- Unconfirmed Contact Reports (more than forty illustrated creatures, and advice on designing horrors of your own)
- The Shipbreaker's Toolkit (the rules for flying, maintaining and fighting with spacecraft)
- Another Bug Hunt (the introductory adventure, in which the crew investigates a remote terraforming colony after a violent attack)
- Dice, punchboard pawns, a poster map and a small Warden's screen
Everything you need is in that box. There is no separate "core rulebook" - the split between player and Warden material is intentional and keeps things tight.
The Mothership RPG Deluxe Set holds the same four rulebooks and Another Bug Hunt, and adds three more adventures: Dead Planet, A Pound of Flesh and Gradient Descent. It also swaps the small screen for a full-size one.
Want to read before you buy? Tuesday Knight Games offers the PDF of the Player's Survival Guide for free. It gives you a solid sense of the game's DNA before you commit.
Who is this game for?
Mothership is a great fit if you want horror-first storytelling in a sci-fi setting. The system rewards player ingenuity and resource management over character power - this is an OSR-adjacent game at heart. If your group enjoys tension, meaningful decisions, and the occasional brutal loss, Mothership will deliver.
It works best with groups willing to lean into atmosphere and prepared for characters to die. If your players prefer long-term character investment or systems that protect them from sudden failure, Mothership may feel brutal.
It handles: survival horror, exploration, crew-based drama, claustrophobic tension. It struggles with: extended campaign play over many sessions, political intrigue, large-scale heroics.
How does it differ from other systems?
Compared to Dungeons & Dragons, Mothership is dramatically leaner. There are no hit points in the traditional sense - wounds are specific, recovery is slow, and combat is dangerous for everyone at the table. Where D&D often rewards persistence, Mothership rewards caution.
Compared to Call of Cthulhu, which shares the horror DNA, Mothership is faster and more focused on physical peril alongside psychological threat. The sci-fi setting also opens up very different narrative territory.
And from the same studio comes Fatherfog, which carries Mothership's d100 bones into fairytale horror: Hope in place of Stress, Despair in place of Panic, and a Guide who never rolls at all.
Its closest rival tells the same kind of story with very different machinery - we weigh them against each other in Mothership vs Alien RPG.
Where do you begin?
- Read the Player's Survival Guide cover to cover - it's short enough to do in an evening.
- Have players build characters together at the table during session zero. It's fast and generates good conversation about the setting.
- Run Another Bug Hunt, the starter adventure included in the box, before attempting to build your own scenarios.
- Once you're comfortable, the Warden's Operations Manual has excellent tools for creating locations, threats, and encounters.
For external resources: the Mothership subreddit (r/mothershiprpg) is active and welcoming. The Tuesday Knight Games website hosts additional free modules and community content. YouTube has several actual plays and intro videos - searching "Mothership RPG actual play" will get you started quickly.
Recommended products
The Mothership Core Set is the obvious starting point - it's a complete, well-designed package that gives you everything at once.
Beyond that, Mothership shines with good adventure modules. Dead Planet is one of the most acclaimed (a dark, brutal dungeon crawl in space), and A Pound of Flesh offers a sprawling space station to explore with its own sandbox structure. Gradient Descent is a longer, more complex delve for groups ready to go deeper. All three come in the Deluxe Set, which makes it the better buy if you already know you will keep playing. More modules sit in our Mothership collection.
If you want to expand the toolkit, the community has produced a large amount of third-party content - much of it high quality and built around the same tight design philosophy.