Mankind prepares for a war with aliens by warring among itself
55121
A story about a guy who helped humanity by being held in a prison
67118
Short story about alien invasion with a twist.
18729
Mentally-linked clones soldier pairs fight wars and nearly destroy the Earth
45497
Story about a deadly alien creature on another planet that has some chemical in its body that makes it faster
131274
Earthlings create and interact with a pocket universe; universe inhabitants eventually desire to escape
55796
Story about space explorers who communicate but then decide they must destroy each other
61571
Sci Fi short story about an alien invasion where the twist is that the invaders are human?
94172
Science Fiction story about humans escaping earth's destruction
107466
Space movie with alien probe that makes the crew turn homicidal
97147
Short story about aliens who invade Earth and are baffled by the climate
791
SF Short Story: alien apes invade during nuclear war
136125
Inhumans vs. Mutants in the Marvel Universe
68229
Mysterious contact by advanced aliens; leaves humans insane
131436
Story about tricking the earth empire into saving hopeless aliens
25643
Martian plagues afflict the Earth
147218
Human visits aliens with advanced hearing and culture with heavy emphasis on music
51413
Protagonist becomes the avatar of an alien deity and has to cope with adversary god