Theirs Not to Reason Why
by Jean Johnson
4.07 · 88 ratings
invasion · time-travel · book · paranormal · space · futuristic · war · female-mc · aliens · action-adventure · fiction · soldiers · sci-fi · space-travel · space-opera · first-contact · military · magic · adult · violent-conflict
Theirs Not to Reason Why: Similar series
The Tower and the Hive
by Anne McCaffrey
3.97 · 170 ratings
space · audiobook · paranormal · romance · female-author · space-opera · space-travel · epic · sci-fi · aliens · fiction · action-adventure · psychics · futuristic · young-adult · supernatural · book · invasion · violent-conflict · female-mc
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Kinsmen
by Ilona Andrews
4.17 · 124 ratings
romance · steamy · urban-fantasy · paranormal · political-intrigue · audiobook · space · alpha-mc · futuristic · female-mc · fiction · action-adventure · sci-fi · assassins · space-opera · adult · magic · book · enemies-to-lovers · dystopia
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Starbound
by Amie Kaufman
3.89 · 124 ratings
futuristic · action-adventure · mystery · aliens · fiction · space-opera · new-adult · sci-fi · book · romance · young-adult · paranormal · space · survival · dystopia · death · male-mc · military · female-author · supernatural
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Catteni
by Anne McCaffrey
3.96 · 124 ratings
sci-fi · space-travel · space-opera · female-author · first-contact · adult · violent-conflict · futuristic · aliens · fiction · action-adventure · audiobook · dystopia · space · invasion · romance · other-world · colonization · female-mc · survival
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Sirantha Jax
by Ann Aguirre
3.89 · 181 ratings
romance · book · urban-fantasy · paranormal · alpha-mc · space · futuristic · female-mc · aliens · fiction · action-adventure · sci-fi · space-opera · military · audiobook · dystopia · space-travel · war · psychics · mystery
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Kricket
by Amy A. Bartol
4.15 · 87 ratings
action-adventure · paranormal · coming-of-age · enemies-to-lovers · contemporary · audiobook · dystopia · alpha-mc · post-apocalyptic · romance · book · urban-fantasy · supernatural · young-adult · new-adult · military · magic · violent-conflict · futuristic · forbidden-love
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Oxford Time Travel
by Connie Willis
3.99 · 128 ratings
historical · female-author · 20th-century · sci-fi · fiction · action-adventure · mystery · time-travel · violent-conflict · historical-fiction · humor · alternate-history · war · futuristic · ww2 · audiobook · paranormal · book · female-mc · drama
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Confluence
by Jennifer Foehner Wells
4.09 · 118 ratings
aliens · exploration · fiction · female-mc · space-opera · space-travel · sci-fi · adult · book · space · action-adventure · violent-conflict · first-contact · invasion · audiobook · futuristic · military · female-author · technothriller · romance
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The Firebird Chronicles
by T.A. White
4.52 · 112 ratings
fiction · space-opera · sci-fi · urban-fantasy · book · paranormal · action-adventure · humor · aliens · female-mc · friendship · slow-burn · futuristic · magic · military · romance · space · alpha-mc · dystopia · adult
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Linesman
by S.K. Dunstall
4.13 · 60 ratings
friendship · aliens · action-adventure · fiction · war · female-author · first-contact · military · space-fleet · adult · violent-conflict · sci-fi · space-opera · invasion · book · audiobook · space · exploration · futuristic · space-travel
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Aldebarian Alliance
by Dianne Duvall
4.37 · 89 ratings
romance · book · vampires · paranormal · audiobook · alpha-mc · female-mc · action-adventure · aliens · fiction · sci-fi · adult · space · humor · military · first-contact · steamy · urban-fantasy · suspense · contemporary
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Theirs Not to Reason Why
by Jean Johnson
4.07 · 88 ratings
invasion · time-travel · book · paranormal · space · futuristic · war · female-mc · aliens · action-adventure · fiction · soldiers · sci-fi · space-travel · space-opera · first-contact · military · magic · adult · violent-conflict
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Vampire Empire
by Clay Griffith
3.82 · 50 ratings
action-adventure · fiction · female-mc · alternate-history · steampunk · war · industrial-era · futuristic · violent-conflict · historical · magic · historical-fiction · horror · dark · sci-fi · royalty · young-adult · supernatural · urban-fantasy · vampires
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Ascension Wars
by Jasper T. Scott
3.86 · 58 ratings
industrial-era · genetic-engineering · space · galactic-empire · colonization · supernatural · invasion · post-apocalyptic · book · military · first-contact · violent-conflict · historical · adult · space-fleet · soldiers · sci-fi · space-travel · exploration · fiction
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Indian Hill
by Mark Tufo
4.49 · 102 ratings
violent-conflict · adult · first-contact · sci-fi · aliens · fiction · book · invasion · post-apocalyptic · space-fleet · military · space-travel · soldiers · action-adventure · exploration · space · audiobook · zombies · colonization · horror
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Dark Space
by Jasper T. Scott
3.84 · 82 ratings
invasion · space-fleet · book · galactic-empire · audiobook · space · fiction · aliens · sci-fi · space-opera · military · violent-conflict · adult · historical · supernatural · genetic-engineering · dystopia · cyberpunk · steampunk · industrial-era
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Cade Korbin Chronicles
by Jasper T. Scott
4.35 · 35 ratings
soldiers · sci-fi · space-travel · first-contact · military · historical · adult · space-fleet · violent-conflict · industrial-era · steampunk · aliens · exploration · fiction · galactic-empire · cyberpunk · genetic-engineering · space · invasion · book
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AL:ICE
by Charles W. Lamb
4.13 · 46 ratings
space · adult · audiobook · dystopia · military · first-contact · litrpg · space-opera · violent-conflict · soldiers · sci-fi · action-adventure · aliens · fiction · harem · book · apocalyptic · time-travel · invasion · post-apocalyptic
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Forsaken Mercenary
by Jonathan Yanez
4.37 · 101 ratings
fiction · action-adventure · adult · sci-fi · book · space · violent-conflict · colonization · post-apocalyptic · space-opera · cyberpunk · genetic-engineering · aliens · industrial-era · steampunk · historical · first-contact · invasion · super-powered · military
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First Salik War
by Jean Johnson
4.00 · 28 ratings
space-opera · invasion · romance · book · space · paranormal · female-mc · fiction · action-adventure · aliens · war · first-contact · military · magic · adult · violent-conflict · sci-fi · royalty · other-world · time-travel
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Shamans & Shifters Space Opera
by Jenny Schwartz
4.33 · 46 ratings
adult · romance · book · shapeshifters · paranormal · space · action-adventure · aliens · fiction · sci-fi · space-travel · space-opera · first-contact · futuristic · outlaws · magic · colonization · fae · galactic-empire · cyberpunk
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Freedom's Fire
by Bobby Adair
4.10 · 52 ratings
colonization · exploration · fiction · invasion · aliens · book · audiobook · military · first-contact · violent-conflict · space · space-fleet · adult · soldiers · epic · sci-fi · space-travel · space-opera · galactic-empire · action-adventure
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Daedalus
by Michael J. Martinez
3.76 · 25 ratings
aliens · action-adventure · exploration · fiction · alternate-history · industrial-era · steampunk · historical · adult · violent-conflict · historical-fiction · space-opera · sci-fi · time-travel · book · invasion · space · first-contact · military · space-travel
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Broken Worlds
by Jasper T. Scott
4.05 · 22 ratings
violent-conflict · invasion · galactic-empire · dystopia · cyberpunk · space · genetic-engineering · industrial-era · steampunk · aliens · fiction · soldiers · sci-fi · first-contact · military · adult · historical · space-fleet · book · supernatural
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