Transgressor Trilogy
by E.M. Swift-Hook
4.33 · 6 ratings
galactic-empire · space · action-adventure · adult · fiction · space-opera · book · sci-fi · dystopia · genetic-engineering
Transgressor Trilogy: Similar series
Undying Mercenaries
by B.V. Larson
4.28 · 383 ratings
war · aliens · soldiers · fiction · sci-fi · space-opera · military · violent-conflict · space-fleet · adult · invasion · book · colonization · galactic-empire · audiobook · space · first-contact · space-travel · hard-sci-fi · exploration
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Legends of Dune
by Brian Herbert
3.70 · 109 ratings
sci-fi · fiction · book · adult · space-opera · action-adventure · classics · space · audiobook · literary · epic · colonization · war · male-author · violent-conflict · galactic-empire · robots · hard-sci-fi · futuristic · post-apocalyptic
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Castle Federation
by Glynn Stewart
4.28 · 151 ratings
fiction · book · military · violent-conflict · space · space-fleet · adult · soldiers · sci-fi · space-opera · galactic-empire · action-adventure · war · audiobook · expert · male-author
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Star Wars: Alphabet Squadron
by Alexander Freed
3.84 · 58 ratings
violent-conflict · lgbtq · book · fiction · action-adventure · sci-fi · galactic-empire · space-opera · military · audiobook · space-fleet · space · adult · war · aliens · other-world · young-adult · mystery · travel · male-mc
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Duchy of Terra Universe
by Glynn Stewart
4.41 · 170 ratings
military · war · book · invasion · aliens · exploration · action-adventure · fiction · galactic-empire · space-travel · space-opera · soldiers · space-fleet · adult · violent-conflict · space · sci-fi · first-contact · audiobook · female-mc
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The Adventures of a Xeno-Archaeologist
by Jenny Schwartz
4.33 · 84 ratings
adult · first-contact · military · space-opera · sci-fi · action-adventure · aliens · fiction · futuristic · space · ai · supernatural · exploration · super-powered · cyberpunk · galactic-empire · book · romance · space-fleet · space-travel
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War Eternal
by M.R. Forbes
4.19 · 151 ratings
invasion · aliens · fiction · space-opera · soldiers · sci-fi · space · adult · space-fleet · military · violent-conflict · book · war · time-travel · action-adventure · first-contact · audiobook · galactic-empire · futuristic · colonization
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Chaos of the Covenant
by M.R. Forbes
4.35 · 109 ratings
invasion · book · angels · audiobook · genetic-engineering · space · female-mc · fiction · aliens · sci-fi · space-opera · military · adult · violent-conflict · soldiers · heroic-fantasy · action-adventure · space-fleet · galactic-empire · demons
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Blood on the Stars
by Jay Allan
4.33 · 243 ratings
fiction · aliens · exploration · first-contact · military · space-fleet · adult · violent-conflict · soldiers · sci-fi · space-travel · space-opera · invasion · book · space · galactic-empire · colonization · war · audiobook · action-adventure
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Crimson Worlds
by Jay Allan
4.11 · 172 ratings
fiction · war · military · violent-conflict · adult · sci-fi · book · space · space-opera · soldiers · aliens · audiobook · first-contact · space-fleet · galactic-empire · action-adventure · invasion · exploration · space-travel · colonization
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Verdant String
by Michelle Diener
4.20 · 59 ratings
romance · alpha-mc · aliens · fiction · female-mc · adult · space-opera · sci-fi · book · space · multi-pov · action-adventure · galactic-empire · mystery · crime · military · soldiers · futuristic · paranormal · ai
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Perseus Gate
by M.D. Cooper
4.33 · 48 ratings
military · cyberpunk · adult · space-fleet · space · violent-conflict · sci-fi · galactic-empire · soldiers · space-opera · fiction · book · audiobook · action-adventure · supernatural
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Wholesale Slaughter
by Rick Partlow
4.41 · 56 ratings
adult · space · space-fleet · violent-conflict · military · galactic-empire · space-travel · soldiers · exploration · fiction · action-adventure · sci-fi · colonization · book · audiobook · space-opera · supernatural · war · invasion · genetic-engineering
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Outworld Ranger
by David Alastair Hayden
4.37 · 38 ratings
adult · violent-conflict · book · action-adventure · fiction · sci-fi · space-opera · galactic-empire · military · space · space-fleet · exploration · space-travel · audiobook · humor · futuristic · aliens · teens · ghosts · ai
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Magitech World
by Chris Fox
4.21 · 38 ratings
book · exploration · fiction · epic · soldiers · space-travel · galactic-empire · audiobook · military · violent-conflict · space · space-fleet · adult · action-adventure · space-opera · magic · fantasy · aliens · high-fantasy · sci-fi
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Rise of the Empire
by Ivan Kal
4.37 · 91 ratings
sci-fi · aliens · fiction · book · space-fleet · adult · space · violent-conflict · litrpg · military · space-opera · colonization · genetic-engineering · space-travel · war · invasion · galactic-empire · royalty · action-adventure · first-contact
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Star Force: Phase 2
by Aer-ki Jyr
4.42 · 262 ratings
action-adventure · aliens · fiction · violent-conflict · military · space-opera · sci-fi · book · space · space-fleet · galactic-empire · adult · soldiers · invasion · colonization · exploration · space-travel · young-adult · immortality · dystopia
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The Delphic Dame
by Jenny Schwartz
4.33 · 21 ratings
first-contact · adult · sci-fi · space-travel · space-opera · exploration · fiction · aliens · super-powered · space · galactic-empire · colonization · book · violent-conflict · action-adventure · cyberpunk · supernatural · invasion · outlaws · futuristic
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Gateway to the Galaxy
by Jonathan Yanez
4.23 · 36 ratings
fiction · sci-fi · military · adult · violent-conflict · humor · super-powered · soldiers · space-opera · space · aliens · first-contact · invasion · book · supernatural · colonization · galactic-empire · action-adventure · space-fleet · genetic-engineering
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Prison World
by Julie K. Cohen
4.00 · 24 ratings
sci-fi · adult · fiction · romance · book · reverse-harem · dark · space-travel · space-opera · polyamory · female-mc · alternate-history · action-adventure · humor · suspense · steamy · new-adult · military · aliens · paranormal
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Tales of Cinnamon City
by Peter James West
3.75 · 12 ratings
space-fleet · adult · dystopia · genetic-engineering · space · violent-conflict · military · galactic-empire · space-opera · soldiers · sci-fi · fiction · action-adventure · colonization · book · post-apocalyptic · ai · epic · war · mystery
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Corwint Central Agent Files
by C.E. Kilgore
3.90 · 20 ratings
adult · book · fiction · space-opera · romance · aliens · sci-fi · galactic-empire · supernatural · action-adventure · paranormal · futuristic · space · cyborgs · mlm · steamy · lgbtq · shapeshifters · crime · religion
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Chronicles of the Second Interstellar Empire of Mankind
by Robert I. Katz
4.25 · 4 ratings
adult · space · genetic-engineering · violent-conflict · military · galactic-empire · sci-fi · fiction · colonization · book · space-opera · box-set · action-adventure · hard-sci-fi · male-mc · space-fleet · politics · space-travel · soldiers · urban
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The Indigo Reports
by Tracy Cooper-Posey
4.50 · 4 ratings
fiction · book · adult · sci-fi · action-adventure · space · violent-conflict · tragedy · galactic-empire · space-opera · victorian · poc-mc · female-mc · amnesia · war · industrial-era · espionage · historical · military · sexual-assault
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