The Frontiers
by Mark Wandrey
4.33 · 3 ratings
violent-conflict · invasion · book · colonization · aliens · exploration · fiction · action-adventure · young-adult · soldiers · galactic-empire · space-travel · first-contact · military · space-fleet
The Frontiers: Similar series
Legacy Fleet Trilogy
by Nick Webb
4.10 · 89 ratings
action-adventure · supernatural · soldiers · sci-fi · galactic-empire · space-opera · first-contact · space-travel · military · audiobook · adult · space-fleet · space · violent-conflict · invasion · war · book · technothriller · colonization · exploration
All books in this 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
All books in this series ❯
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
All books in this series ❯
Extinction Wars
by Vaughn Heppner
4.07 · 72 ratings
book · invasion · aliens · exploration · fiction · action-adventure · colonization · galactic-empire · space-opera · space-travel · soldiers · sci-fi · adult · space-fleet · space · violent-conflict · first-contact · military · audiobook · war
All books in this series ❯
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
All books in this series ❯
Drop Trooper
by Rick Partlow
4.38 · 152 ratings
military · space-fleet · adult · violent-conflict · soldiers · galactic-empire · colonization · aliens · fiction · invasion · book · space · sci-fi · space-travel · action-adventure · exploration · first-contact · space-opera · war · audiobook
All books in this series ❯
Aurora Rising
by G.S. Jennsen
4.13 · 66 ratings
sci-fi · space-travel · space-opera · military · first-contact · action-adventure · fiction · galactic-empire · cyberpunk · colonization · violent-conflict · space-fleet · aliens · exploration · ai · space · romance · book · soldiers · adult
All books in this series ❯
Portal Wars
by Jay Allan
3.99 · 38 ratings
soldiers · exploration · fiction · action-adventure · aliens · sci-fi · colonization · war · book · invasion · space-fleet · adult · dystopia · space · violent-conflict · first-contact · audiobook · military · galactic-empire · space-travel
All books in this series ❯
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
All books in this series ❯
Earthrise
by Daniel Arenson
4.01 · 136 ratings
aliens · exploration · fiction · military · adult · space-fleet · violent-conflict · soldiers · sci-fi · space-opera · space-travel · colonization · invasion · book · space · galactic-empire · first-contact · audiobook · action-adventure · dystopia
All books in this series ❯
The Last War
by Peter Bostrom
4.09 · 34 ratings
aliens · exploration · colonization · fiction · book · technothriller · invasion · genetic-engineering · space · space-fleet · adult · military · violent-conflict · first-contact · space-travel · space-opera · galactic-empire · soldiers · sci-fi · action-adventure
All books in this series ❯
The Salvage Title Trilogy
by Kevin Steverson
4.31 · 33 ratings
space · invasion · war · book · literary-fiction · colonization · aliens · action-adventure · exploration · fiction · soldiers · galactic-empire · sci-fi · ai · space-opera · space-travel · first-contact · military · space-fleet · adult
All books in this series ❯
The Last Hunter
by J.N. Chaney
4.44 · 127 ratings
book · invasion · aliens · fiction · colonization · galactic-empire · space-opera · soldiers · sci-fi · adult · space-fleet · space · genetic-engineering · violent-conflict · military · first-contact · action-adventure · audiobook · exploration · space-travel
All books in this series ❯
Valerie’s Elites
by Justin Sloan
4.51 · 31 ratings
galactic-empire · space-travel · soldiers · sci-fi · space-fleet · space · genetic-engineering · first-contact · violent-conflict · military · audiobook · book · invasion · aliens · exploration · fiction · action-adventure · colonization · shapeshifters · vampires
All books in this series ❯
The Ixan Universe
by Scott Bartlett
3.94 · 54 ratings
fiction · soldiers · sci-fi · space-opera · military · adult · space-fleet · violent-conflict · book · galactic-empire · audiobook · space · hard-sci-fi · aliens · first-contact · invasion · colonization · action-adventure · space-travel · supernatural
All books in this series ❯
Omega War
by Jason Córdova
4.45 · 80 ratings
aliens · exploration · fiction · action-adventure · sci-fi · colonization · literary-fiction · book · invasion · adult · space-fleet · space · violent-conflict · first-contact · military · galactic-empire · space-travel · soldiers · space-opera · friendship
All books in this series ❯
A.I. Destiny
by Timothy Ellis
4.25 · 40 ratings
sci-fi · young-adult · supernatural · book · space · cyberpunk · coming-of-age · galactic-empire · exploration · fiction · violent-conflict · space-fleet · military · first-contact · space-travel · space-opera · soldiers · epic · colonization · invasion
All books in this series ❯
War Wolves
by Jonathan Yanez
4.20 · 20 ratings
space-fleet · invasion · book · colonization · aliens · exploration · fiction · soldiers · sci-fi · space-opera · space-travel · military · first-contact · space · violent-conflict · adult · action-adventure · galactic-empire · genetic-engineering · supernatural
All books in this series ❯
The Eurynome Code
by K. Gorman
4.27 · 22 ratings
space · book · military · female-author · violent-conflict · first-contact · space-fleet · adult · sci-fi · space-opera · fiction · audiobook · genetic-engineering · galactic-empire · colonization · soldiers · space-travel · female-mc · action-adventure · aliens
All books in this series ❯
Lunar Free State
by John E. Siers
4.40 · 15 ratings
literary-fiction · book · invasion · aliens · exploration · fiction · action-adventure · colonization · galactic-empire · space-opera · space-travel · soldiers · sci-fi · space-fleet · space · violent-conflict · first-contact · military · war · adult
All books in this series ❯
Alpha Alien
by Flora Dare
3.37 · 19 ratings
fiction · romance · steamy · sci-fi · adult · aliens · paranormal · contemporary · inter-galactic · book · space · humor · galactic-empire · exploration · genetic-engineering · invasion · colonization · soldiers · space-travel · first-contact
All books in this series ❯
Revant Warriors
by Celeste Raye
3.91 · 11 ratings
fiction · adult · aliens · exploration · soldiers · sci-fi · space-travel · galactic-empire · military · first-contact · genetic-engineering · cyberpunk · invasion · space-fleet · violent-conflict · book · colonization · action-adventure · paranormal · romance
All books in this series ❯
Blue Planet Warriors
by Maia Starr
3.93 · 14 ratings
aliens · fiction · adult · sci-fi · exploration · action-adventure · futuristic · space-fleet · violent-conflict · first-contact · military · space-travel · soldiers · colonization · book · invasion · romance · genetic-engineering · galactic-empire · paranormal
All books in this series ❯
Lost on the Last Continent
by John C. Wright
4.00 · 5 ratings
action-adventure · aliens · exploration · fiction · colonization · book · literary-fiction · time-travel · invasion · space · space-fleet · adult · violent-conflict · military · first-contact · space-travel · galactic-empire · soldiers · male-author · sci-fi
All books in this series ❯