In poetry, the transformation from caterpillar to butterfly describes how something ugly becomes uniquely beautiful. But in nature metamorphosis is common as living things change forms over their life cycles. And this change is not just traditional fairy tale beauty: maggots become flies, tadpoles become frogs, and chest bursters become alien warriors. The eight creature sets below show how very dissimilar creatures can be the same species, just young or mature forms. Each entry uses either the animate seeds plant mutation; a new version for animals called larval form; or the idea of forced metamorphosis.

 This publication is dedicated to providing useful information, game content, and ideas to players of modern, science fiction, and post-apocalyptic table-top and role-playing games in general and to fans of Goblinoid Games’ Mutant Future retroclone of classic Gamma World in particular. The rules contained herein are compatible with it and any others that use the “Basic” OGL/d20 RPG system.