Science Fiction Writing Prompts

An assassin tries to assassinate a human representative on the Galactic Government by poisoning their drink with water. When that fails they fill their sleeping quarters with oxygen.

When robots became sentient, we expected them to attack humans. We were completely surprised by their actual target

You were born in the Medieval Age, but at 15, a time anomaly brought you to the modern era, where a scientist adopted you. Now, 11 years later, they’ve found a way to send you back and asked for your opinion, but your answer is clear: "Hell no."

When you were a kid, you and your friends found an alien and helped them elude the government along with getting them back to their ship safely. About twenty years later, they came back with an armada in order to invade Earth.

Fantasy races banished humanity to another realme for 50000 years and when the banishment ended the fantasy races came to invite humanity back only to find that they have built ring worlds, Dyson spheres and mind uploaded themselves.

The probe sent back 12 seconds of video from the afterlife, before it was utterly destroyed. 12 seconds which have now united humanity in a desperate search for immortality.

Other alien species have warriorcasts with selected members of their society who can kill, a rare feature. Humans have military and soldiers, and today the aliens learn that any human can join the military.

You are a litch who, in an attempt to escape the hero, managed to telekinetically throw yourself into space and landed on the moon. After countless years, you've managed to create a comfortable life for yourself, only for a space shuttle and some astronauts to land nearby and plant a flag.

The first spaceship to achieve FTL is stopped by the Universe Police and given a speeding ticket.

When a soldier loses a limb, it is a tragedy. Soldiers are needed at peak efficiency, so they must undergoes the unthinkable - grafting metal to flesh. A horrific abomination, the mere process is often enough to shatter what is left of their mind. Then, there are the humans.

Aliens arrive at Earth, and inform us that our solar system must regretfully be processed into rocks to throw at the invasion of the Outer Gods that has been ongoing for billions of years. “Well, why don’t you let us take a crack at it for a hundred years or so? What’ve you got to lose?”

Humans have always been endurance hunters. We can endure untold physical, psychological, and emotional trauma. Being so unexceptional, we are mocked by the intergalactic community until war shows how terrifying it is to simply... endure.

"Having seen how well humans treat their defeated enemies we wish to formally declare our surrender." "But we're not at war.", "Of course not we were hoping to skip that bit"

You are an alien assassin tasked with killing the human ambassador. Only to find out all your poisons like caffeine, chocolate, capsaicin, tabacco mint etc. Don't work

"No, no. Trust me; it works. Humans love to take care of pregnant and baby things. I've even seen them adopt things they eat!" "What about things that eat them?" "Oh, humans like those best of all! So just go up and act weak, they'll take care of the rest."

“Alexa, cancel the timer,” you say. “You have two timers: a nine-minute pasta timer with two minutes left, and a 4.5-billion year Earth timer with three months left. Which did you want to cancel?” You don’t remember setting the second one.

Your sibling can rewind time and you're the only one that remembers. usually they use it sparingly but today has been repeating a suspicious number of times.

After Earth was declared a galactic safe haven, anti-xenoterrestrial sentiment began to rise. You, a second generation immigrant from another planet, calmly walk down the street when a voice yells at you "Go back to Mars!" You snap back "I was born in Chicago!"

An alien race destroyed half of one continent, in in response the Humans destroyed half of the alien homeworld. When called to the Galactic Council for trial the humans response was "It's a proportional response!"

Super powers have started to appear in the general population. However, unlike comics, there are no secondary powers to make one immune to the actual physics of one’s power. This has led to some interesting case studies.

You're the first test subject for an experimental super soldier serum. You are told the truth only after you transform into something not quite human anymore.

Every time humanity makes a new discovery, it's only a short matter of time before it's weaponized. This happened with fire, iron, ships, gunpowder, aircraft, and nuclear power, to name a few. In a world shaken by the discovery of souls and the afterlife, this trend holds true.

"A warning: Humans, from the planet known to them as Earth, will adopt anything they deem childlike and will go to extreme lengths to protect that adopted creature and spoil it to eternity." The high representative's letter addressed to the galaxy read as some previous incidents became clear.

Years ago you came up with a nonsensical code phrase that you would use if you ever went back in time and needed to convince yourself of who you were. You never wrote it down or told anyone what it was. Today a young woman you’ve never met walks up to you on the sidewalk and speaks the phrase.

In an age where gaming is widespread, militaries all over the world swiftly (and successfully) adapt by drafting gamers and assigning them into units and roles based on mandatory tracking of their most played genre and overall gametime. You just got your draft letter.

As we gazed across the fields, he remarked: "I remember when this was all skyscrapers..."

You've always had the gift; touching the dead you live their last moments through their eyes. As a paleontologist, it helped you recreate scenes from by-gone eras in astonishing detail. However, this time, you wish you hadn't touched the fossil.

Ten years ago everyone else on Earth disappeared. Now they are all back. Everyone says the same thing. Ten years ago, everyone else but them disappeared.

"What do you mean the humans REJECTED our declaration of war?! That's not how that works!"

Ever since joining the galactic society, humanity has been in a golden age of peace, restoration, and learning. We just learned that we are, in truth, the newest slave world of an evil empire, most people just had it so bad that it's still a step up.