More like The Two Doctors

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H. G. Wells' War of the WorldsUniverse
universe65 books1898
Alien invasion.
“No one would have believed, in the closing years of the nineteenth century, that human affairs were being watched keenly and closely from the timeless worlds of space.”
from the catalogue
Start with The War of the Worlds →
includes The War of the Worlds
Ender's GameUniverse
universe39 books1977
Set in far future.
“To beat your enemy you must first understand him so completely that you love him — and in the instant you love him, you destroy him.”
from the catalogue
Start with Ender's Game →
includes Ender Wiggin, First Formic War, Second Formic War, Ender's Shadow, Fleet School
Known SpaceUniverse
universe142 books1964
Set in far future and space.
“Give a clever species a few centuries and a working fusion drive, and it will fill the sky with problems.”
from the catalogue
Start with Ringworld →
includes Man-Kzin Wars, Fleet of Worlds, Ringworld
ThistledownSeries
series5 books1978
completed
Hard science fiction, about space exploration, set in far future and space.
Start with The Wind from a Burning Woman →
CoDominiumUniverse
universe98 books1971
Military science fiction, set in other star systems and far future.
“The body of work runs along a few hard threads rather than one line.”
from the catalogue
Start with The Mote in God's Eye →
includes Moties, Falkenberg's Legion, Laurie Jo Hansen, War World
Double StarNovel
Robert A. Heinleinstandalone novel1956
About political intrigue and identity, set in far future.
“Lorenzo Smythe, the excellent yet unemployed actor, meets Dak Broadbent in a bar.”
from the catalogue