More like Alternamorphs

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FootfallNovel
Larry Niven & Jerry Pournellestandalone novel1985
Alien invasion and first contact, about war, set in north america.
“When aliens travel to Earth from Alpha Centauri, differences between alien and human psychology result in an unprovoked invasion, and the resulting resistance results in the aliens' use of a devastating weapon.”
from the catalogue
The Andromeda StrainSeries
series2 books1969
About plague and pandemic.
“Daniel H. Wilson's authorized 2019 sequel The Andromeda Evolution revisits the same threat five decades later.”
from the catalogue
Start with The Andromeda Strain →
The WandererNovel
Fritz Leiberstandalone novel1964
Set in space.
TripodsSeries
series4 books1967
completed
Post-apocalyptic, about rebellion and revolution, set in near future.
“The first two books were the basis of a science fiction TV series, produced in the United Kingdom in the 1980s.”
from the catalogue
Start with When the Tripods Came →
The Apocalypse TrollNovel
David Weberstandalone novel1999
Time travel and alien invasion, about war.
NeedleSeries
series2 books1950
completed
Hard science fiction.
“Together the mismatched pair must learn to communicate and cooperate, first to survive and later to track down the second alien, which has hidden inside another human in the same Pacific island community.”
from the catalogue
Start with Needle →