Welcome to Nebula California

Emblem-important.svg Not Canon!
The subject of this article does not contribute canonical content to the BattleTech universe, either because it is not intended to or because it is not an official product.
See the article's section on Canonicity for details.

California Nebula.JPG
Welcome to the Nebula California
Product information
Type Sourcebook/Plotbook
(April Fools joke)
Development Ben Rome
Primary writing Herb A. Beas II
Paul Sjardijn
Pages 74
Cover artwork Matt Cross, David Kerber
Interior artwork Matt Cross, David Kerber
Publication information
Publisher Catalyst Game Labs
Product code E-CAT35APR23
First published 1 April 2015
MSRP (free)
Era Dark Age
Timeline 3105
Series April Fools releases

Welcome to the Nebula California is a humorous sourcebook and plot book, released as a free 2015 April Fools product.

The sourcebook is done in the style of an Interstellar Expeditions report on the rimward region of space known as the California Nebula. The report details several inhabited worlds that are incredible different (to the BattleTech universe) civilizations. However, the expedition also faces the inability to return to the Inner Sphere.

The sourcebook provides regional data, character creation rules, record sheets, Alpha Strike Cards, weapons/equipment rules, and units customized for this non-canon adventure.

Official Product Description[edit]

I Think I Feel a Song Coming On!

ComStar lied! (We know: Big shock!) They said they checked out this distant rimward nebula, which ancient charts called “California” for some reason. Perhaps because someone in IE’s corporate mish­mash of a leadership didn’t trust them—or more likely because they forgot that there even was a report from the Explorer Corps—the loose confederation of explorers, prospectors, and dig gypsies who make up Interstellar Expeditions thought they’d check it out again... Contrary to an unremarkable (and uninhabited) region of stars surrounded by the dusty shell of a millions­-year-­old explosion, IE’s expedition to the California Nebula has made some startling discoveries!

Welcome to the Nebula California (AKA Explorer’s Report: California Nebula) offers a few new venues for off­beat BattleTech adventures far from the hustle, bustle, and yet predictable chaos of the Dark Age­ era Inner Sphere. Here, far from known civilizations (and from HPGs!), are worlds, societies, and technologies unlike any seen back home! Special rules, back-stories,and yes, even record sheets, are included for a host of new (and hopefully unique) ...things, ready for play in your (really) advanced BattleTech and A Time of War games.


  • Explorers Report: California Nebula
  • Monsters of Iron and Fire (Short Story)
  • The Forgotten Kingdoms of Toreel
  • The Star Empire
    Technical Specs - T-Fighter 
    Technical Specs - X-Fighter 
    Technical Specs - Scout Walker 
    Technical Specs - Assault Transport 
  • Drones of Syberia
Selected Syberia Drone Units
  • Seeker-Class Fighter Mech 
    Sounder-Class Wheeled Mech 
    Beetle-Class Wheeled Mech 
    Grimdark-Class Bestial Mech 
    Tankus-Class Tracked Mech 
    Leader-Class Wheeled Mech 
  • The Superior Humans of "Earth"
    Circulus Oculus 
    Jane Grey 
    Skunk Bear 
  • Conclusions
  • Rules Annex
    Castles and Critters / Roadfinder 
    Force Gets Disturbed 
    Till Are Won 
    Earth's Haughtiest Heroes
  • Record Sheets
  • Alpha Strike Data Cards

Summarized Technical Specifications: Star Empire[edit]

  • T-Fighter: 8-Ton Aerospace Fighter with a 10-rated Fusion Engine (giving a meager 2.5G acceleration factor), 500 kilograms of Commercial Armor, and armed with two Laser Cannons.
  • X-Fighter: 30-Ton Aerospace Fighter with a 30-rated Fusion Engine (2.5G), 2 tons of Commercial Armor, four Laser Cannons, two Proton Torpedo Launchers with 3 shots each, and a Fighter-scale Deflector Shield. A variant exists which trades each Laser Cannons for an Inner Sphere Medium Laser.
  • Scout Walker: 12-ton Scout Mech, equipped with a 75-rated Fuel Cell (giving it 5/8/0 movement), a singular Dual Small Blaster Cannon, a single Large Blaster Cannon, one Vehicular Grenade Launcher and 1.5 tons of Standard Armor.
  • Assault Walker: 120-ton Superheavy Quad Mech, functioning as a troop transport. It is protected by 7 tons of Industrial Armor, carries a pair of Laser Cannons and a pair of Large Blaster Cannons, has two infantry compartments (each of which can house 21 troops), and a 1-ton cargo bay which houses 5 hover bikes. A 360-rated Fusion Engine gives it a 3/5/0 movement profile.
  • Laser Cannon: Technically a plasma weapon, and not an actual laser. The size, range and mass of this weapon are all identical to a Medium Laser, but the heat and damage are both identical to a Large Laser.


As an April Fools product, this PDF is explicitly considered non-canonical. The book also serves as parody book, with a number of references to favorite science fiction genres and franchises. The name of the product is a nod too the song "Hotel California" by the rock band, the Eagles.

Included in the book are sections which parody Dungeons and Dragons, Transformers, Star Wars, and both the Marvel and DC super hero universes.