Catastrophe Unlimited is an original BattleTech novella penned by Michael A. Stackpole, the third of four parts of a serial novel. It was offered as a backer reward for Harebrained Schemes' successful BattleTech Video Game Kickstarter campaign, and was released in electronic format on 27 February 2018 to Kickstarter backers who had pledged at least 50 US$ to the project.