The Serenity Role Playing Game is a science fiction role-playing game released in 2005 and set in the universe of the movie Serenity and television series Firefly. It is produced by Margaret Weis Productions, Ltd, and its mechanics are the first iteration of the Cortex System.

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From Serenity through Battlestar Galactica to the Stand-Alone Rules for Cortex, what has been changed?

I get the impression that the Cortex RPG system has evolved in several directions since the release of the Serenity RPG. Not including genre-specific changes like whatever rules for the supernatural ...