This April Fool's release for BattleTech is fluff-and-crunch-based parody of multiple classic franchises (mainly stuff you'd remember from the 80's and 90's), showing what happens when the Interstellar Explorers of BattleTech are dropped into lawyer-friendly versions of the worlds of D&D, Transformers, and DC and Marvel's worlds of superheroes. It's fairly amusing as far as the writing goes. Nebula California takes the parody factor a step beyond by providing rules for incorporating these crossover-ish elements into games, including rules for transforming 'mechs and superpowered RPG characters, among other things.

It might not ever be used in much of any serious capacity if it ever gets played with, but it's an entertaining read.