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Terminal.png This article, Thermopylae-class Cruiser, was written by Ajax 013. Please do not edit this fiction without the writer's permission.
Thermopylae-class Cruiser
Production information

Reyes-McLees Shipyards





Technical specifications

1192 metres


293 metres


375 metres

Engine unit(s)

Plasma Fusion Drive

Slipspace Drive

Shaw-Fujikawa Model 52

Slipspace velocity

912 light years per day


Grade 5 shield

  • Laminated shell
  • Layers of Titanium A4
  • Layers of AEGIS
  • Thermal energy absorbing layers
  • Kinetic absorbing layers
  • Aero gel layer
    • 21 metres of plating
Sensor systems
  • AN/SPY-9 PAVE HOUND Active Electronically Scanned Array RADAR
  • AN/SPY-7 PAVE SAW Radio Telescope
  • AN/SSS-19 SAFEGUARD Electromagnetic Array
  • AN/SSS-19 REARGUARD Electromagnetic Array
  • AN/SVS-68 Optical Telescope
  • AN/SAS-67 Infra-red Telescope
  • AN/SSQ-23 Sensor Network
Targeting systems

Multispectrum Optical AI assisted camera network

Navigation system

AI assisted Slipspace 'MAZE' directional router

  • AI/Manual driven computer supported pilot systems

AI Assisted ADIS

  • MASER communications dish
  • Slipspace LASER communication system
  • War Net Integrated computer

Anti ship warfare


United Nations Space Command


"Bring forth the storm"
―Admiral Korolyov ordering the Thermopylae-class Cruisers of the 8th fleet to press forwards.

The UNSC Thermopylae was a replacement for the aging Marathon- and the even older Halcyon-class cruisers. Improving on the tried and tested design of the Marathon-class, it has improved its armour, weaponry, sensors, and engines, creating a ship that far exceeds its predecessor. Possessing firepower, armour, and speed, the Thermopylae-class represents the backbone of the UNSC Navy.

The Thermopylae-class Cruiser uses the basic design of the Marathon-class, sharing much of its superstructure, and internal structure, but has radically altered the armour plating design, and has a newly designed drive section, giving it improved armour and power. The weapon systems have been reorganised to improve both offensive and defensive fire. The ship also includes next-gen sensor elements and shield components, making it cutting edge in capability, if not in appearance.

The Thermopylae-class works as a multi-role vessel, providing offence against enemy capital ships, and defence for the Battle Group's carrier. Such vessels serve to hammer the enemy at range and provide area defence through ship-board weaponry and on-board aircraft. It can also conduct assault missions, being capable of carrying a sizeable marine unit for deploying to the ground for combat operations. Such missions can include relief, reaction forces, peace keeping, or reconnaissance. For naval combat, the UNSCN strategy dictates that a Thermopylae-class never engage alone, and always conducts strike operations in tandem with another cruiser, or with a supporting squadron of escorts, moving the advantage to the UNSC vessels.

Often, these form a vital cruiser line in any Battle Group, but also form independent cruiser squadrons, being used as flexible units for reinforcing the naval line. The cruiser excels in frontal assault roles, with a slim profile, and the ability to train a number of its guns to forward positions, it can avoid enemy fire, and pound the enemy with withering fire in return.

UNSC Comments

"She looks like a smoother Marathon-class and she's a lot faster and boy does she back a punch."

"Gone are the days of frigates and destroyers incapacitating our mightiest vessels!"

Ships of the line

  • UNSC Thor
  • UNSC Ghost of Reach
  • UNSC Heart of Iron
  • UNSC Chicago
  • UNSC Newcastle
  • UNSC Capetown
  • UNSC Storm Bringer
  • UNSC Gothic
  • UNSC Telamon
  • UNSC Warbringer
  • UNSC Midway
  • UNSC Constitution
  • UNSC Ruby
  • UNSC Rodan
  • UNSC Anguirus
Warships of the UNSCDF Navy

Stealth Vessels
Minerva-class Prowler | Cerberus-class Strike Prowler | Obsidian-class Heavy Prowler | Reckoning-class Attack Prowler | Scáthach-class Command Prowler | Nyx-class Sloop | Auriga-class Light Prowler | Crux-class Sub-Prowler

Light Craft

Raven-class Assault Shuttle | Wyvren-class Light Corvette | Durham-class Corvette | Romulus-class Heavy Corvette | Saint Elisa-class Cutter | Nemesis-class Sloop


Vanguard-class Light Frigate | Rivia-class Frigate | Griffin-class Frigate | Heimdall-class Frigate | Jaeger-class Frigate | Helios-class Heavy Frigate | Ronin-class Stealth Frigate


Oberon-class Light Destroyer | Indra-class Destroyer | Platinum-class Destroyer | Centurion-class Hunter-Killer Destroyer | Revanchist-class Picket Destroyer | Ferrus-class Heavy Destroyer | Raijin-class Escort Destroyer | Tyne-class Command Destroyer


Artemis-class Scout Cruiser | Tempest-class Light Cruiser | Valkyrie-class Light Cruiser | Thermopylae-class Cruiser | Delphinus-class Cruiser | Cannae-class Cruiser | Sentinel-class Anti-Aircraft Cruiser | Victoria-class Heavy Cruiser | Reach-class Heavy Cruiser | Athena-class Command Cruiser | Talion-class Battlecruiser | Keyes-class Battlecruiser | Andraste-class Strike Cruiser | Bishamonten-class Assault Cruiser


Endeavour-class Assault Ship | Iskander-class Light Carrier | Argo-class Assault Carrier | Astraeus-class Support Carrier | Bastion-class Carrier | Odin-class Carrier | Damocles-class Heavy Carrier | Pendragon-class Super Carrier | Sol-class Command Carrier


Cavalier-class Fast Battleship | Kataphrakt-class Battleship | Archangel-class Arsenal Ship | Titan-class Dreadnought | Ragnarök-class Dreadnaught

Special Vessels

Hyperion-class Drone Ship | Hellfire-class Drone Ship

Support Ships

Aether-class Science Vessel | Dawn-class Exploration Vessel | Luna-class Research Vessel | Diomedes-class Combat Supply Ship | Exile-class Armed Transport | Werewolf-class Q-Ship | Hecate-class Tender | Briareos-class Troop Carrier | Vulcan-class Repair Ship | Demeter-class Agriculture Ship | Ysionris Jeromi-class Hospital Ship | Atlas-class Cargo Ship | Ebon-class Fast transport Ship | Gigantes-class Tug | Odysseus-class Colony Ship

Mobile Battle Station

UNSC Lord Hood

Orbital Stations

Oranos-class Orbital Defense Platform | Kronos-class Command Platform | Hestia-class Medical Platform | Ptah-class Repair Platform | Hephaestus-class Supply Platform | Gaia-class Colony Platform

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