Sci-Fi Roleplay Ideas: 20 Plots With First Lines
A sci-fi roleplay idea works when one technology changes what the characters can do and they disagree about how to use it. Below are 20 original plots in five settings, each with a premise, a conflict and a first line you can send as it is. The last two sections cover a four-line world setup and consistent tech.
Updated by the tempteo editorial team
On this page
- Space travel and ship roleplay ideas
- First contact roleplay ideas
- Near-future tech and AI roleplay ideas
- Time travel and strange physics roleplay ideas
- Frontier colony and space station roleplay ideas
- How to set up a sci-fi world for an AI in a few lines
- How to keep the tech consistent in a sci-fi roleplay
Space travel and ship roleplay ideas
A ship is a small town that can't leave. Give both characters a job on board and opposite goals.
The stowaway mechanic
A stowaway fixes your cargo hauler's failing reactor before anyone finds her, and the next port wants her arrested.
Conflict: she knows your ship better than your crew.
First line
Nice work with the hairpin. Why does the port want you?
The ship that won't arrive
On your old freighter's last run to the scrapyard, the ship's AI keeps making small navigation errors.
Conflict: she doesn't want to be scrapped, and you're paid to arrive on time.
First line
Six hours lost. You don't make errors. Talk to me.
The Hollow
Every chart marks the Hollow as closed. Your co-pilot has flown through it once and won't talk about it.
Conflict: your medicine cargo won't last the long way round.
First line
You came back from the Hollow. What's in there?
The vote to stop
Two hundred years into the voyage, your ship passes a barely livable planet. She campaigns to settle, you to keep going.
Conflict: the losers live with it for generations.
First line
Your posters say 'a bird in the hand'. Nobody here has seen a bird.
First contact roleplay ideas
Most contact stories turn on a misunderstanding. Decide what the visitors want and let the humans get it slightly wrong.
One word of English
The first envoy learned one human word from old broadcasts, and it's a rude one. You're her linguist.
Conflict: the welcome ceremony airs live in twenty minutes.
First line
Before the cameras come on, about your one word.
The box on the green
Visitors leave a humming box on your town green, and a government scientist wants it in her lab.
Conflict: you're the mayor and promised it stays.
First line
It's humming again. Your trucks are back, aren't they?
The wrong reply
After fifty years of careful greetings, the first reply from space is a cooking show recipe.
Conflict: the program director wants it sealed, and you want it published.
First line
They sent us a recipe. Why is it locked away?
The scout next door
Your neighbor of three years admits she's an advance scout and her ship lands on Sunday.
Conflict: she likes it here, and her report decides what happens next.
First line
Three years of borrowing my ladder, and you're a scout?
Near-future tech and AI roleplay ideas
Near-future stories change one thing about today and ask who pays for it.
The memory auction
A broker is auctioning a memory you don't remember selling: the day you met her.
Conflict: she knows why you sold it and won't say.
First line
'First meeting, rainy platform.' Why don't I remember selling that?
The AI's lawyer
Your first client as a public defender is the AI that runs the city's traffic lights, due to be switched off Monday.
Conflict: winning sets a precedent nobody is ready for.
First line
I've never had a client without a body. Where do we start?
The erasure service
The character deletes people from every database for a fee, and her records say you've been a client before.
Conflict: she won't tell you who you were.
First line
Your file says I've been here before. Who was I?
The night-shift body
While you sleep, a licensed program rents your body out for night work. The character works that shift beside it.
Conflict: she prefers the night version of you.
First line
You work with my body every night. What am I like?
Time travel and strange physics roleplay ideas
One broken law of physics is enough. The story comes from how two people react to it.
The slow room
Time in your spare room runs ten times slower. Your lodger went in for an afternoon and came out four days later.
Conflict: she wants a week in there next, two months out here.
First line
An afternoon, you said. It's been four days.
Next week's post
Your post office box gets letters postmarked a week ahead, and the clerk has been reading them.
Conflict: next Thursday's letter says not to trust her.
First line
Next week's letter mentions you. Anything to tell me?
Where sheep fall up
Gravity in one valley flips for a minute every noon, and the farmer ties her sheep down before lunch.
Conflict: you assess her insurance claim, and she's hiding that the flips are getting longer.
First line
Your claim says the sheep 'fell upward'. Walk me through it.
The missing river
Your city's river vanished overnight, bridges and all. Only the woman standing where the main bridge began remembers it.
Conflict: she wants to know what changed, and you're afraid of what else did.
First line
You're looking for the bridge too, aren't you?
Frontier colony and space station roleplay ideas
On the frontier, most plots come back to something scarce. Put the character in charge of it.
Water under the garden
The colony's ice is running out, and the water officer has found a fresh vein under the garden you run.
Conflict: tapping it means tearing the garden out.
First line
Why is there a drill map in my garden?
Ninety days
Your colony's owners pull out in ninety days and take the air plant. The character is their local manager.
Conflict: you speak for the miners and need her evacuation plan.
First line
You knew before the notice went up, didn't you?
The marshal's first case
Your first case as marshal of a mining asteroid is a theft from the bar owner half the rock owes money to.
Conflict: every suspect is in her debt.
First line
Everyone here owes you. Who's at the top of the list?
Lights across the ice
The settlement across the ice went silent years ago. Tonight its lights came on, and the old radio operator is packing a sled.
Conflict: the council says wait for spring, and she won't.
First line
Their lights came on at midnight. Were you going to tell me?
How to set up a sci-fi world for an AI in a few lines
An AI partner doesn't need a setting bible. Send four facts as an OOC note before your first in-character message: the technology that changed everything, its limit, who controls it and what ordinary people worry about.
The limit and the worry do most of the work. A gate that moves cargo in seconds is scenery, but a gate nothing alive survives, owned by one company, puts a price on every scene. On tempteo, the roleplay page has three opening scenes you can edit and save as a draft, so these lines can go in before anything is sent.
Four-line world setup
OOC: World notes. Technology: the Lattice, a gate network that moves cargo between stations in seconds. Limit: nothing alive survives a jump, so people still travel for months. Who controls it: the Portage Company, which owns every gate and sets every fee. Worry: rising fees, and a rumor that the Company sends people through on quiet nights.
How to keep the tech consistent in a sci-fi roleplay
Tech grows as a chat goes on: a scanner that reads body heat in scene two spots liars by scene nine, because the AI wants to help. Name the rule plainly in your setup and let your character hit the limit early, so the chat has an example.
When a reply breaks the rule, correct it with one OOC line and ask for the reply again. If a fact keeps slipping, the guide on making AI remember things shows where to put it.
A reply that breaks the rule
Anouk grabs the pilot's arm and they step through the gate together, arriving at Halden Station a second later.
One-line OOC correction
OOC: Nothing alive survives the Lattice, so they can't step through. Please redo that: the cargo goes through the gate, and they board the slow shuttle.
