The phrase "alien scenario" is correct and usable in written English.
It can be used to describe a situation or setting that is foreign, unusual, or not typical, often in the context of science fiction or hypothetical situations.
Example: "In this alien scenario, humans must adapt to life on a distant planet inhabited by intelligent extraterrestrial beings."
Alternatives: "foreign situation" or "unfamiliar context".
A familiar alien invasion scenario yields a different kind of sci-fi here – intelligent, atmospheric, spectacular and surprisingly moving.
'Yellow Blue Tibia' by Adam Roberts is about Stalin who calls together a group of science fiction writers to invent an alien invasion scenario to help the Soviet state, who need an enemy to rally against.
Other first-person shooter games may incorporate imaginative variations of weapons, including future prototypes, "alien technology" scenario defined weaponry, and/or utilizing a wide array of projectiles, from industrial labor tools to laser, energy, plasma, rocket and grenade launchers or crossbows.
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According to Robert Freitas, author of several books outlining possible alien contact scenarios, in 1950 the U.S. military developed a procedure called "Seven Steps to Contact," laying out the logical steps we would take upon discovering creatures with roughly human-level sentience.
"Space is full of life and danger and you are an alien in that scenario – not everyone wants to be friendly.
The Visit, a documentary by Danish director Michael Madsen, presents a scenario: aliens have arrived on earth, we know nothing of their intentions, only that they are here.
Alien landscapes, apocalyptic scenarios, and mythical creatures engulfed the sky in what was basically an hour-long acid trip designed by Czech projection mapping auteurs Dan Gregor and Dalibor Cée.
Baffling as Fringe often was, it maintained a current of vibrant futuristic invention that set it apart from the more familiar alien invasion sci-fi scenarios seen in Marvel fare such as The Avengers.
