Question: The Cortex System is a generic RPG system based on the "Sovereign Stone System ", and was developed by Margaret Weis Productions, Ltd for the Serenity Role Playing Game, a science fiction role-playing game released in which year, and set in the universe of the movie "Serenity"?

Context paragraphs:
Sovereign Stone: The Sovereign Stone series is a trilogy of novels.  The "Sovereign Stone" Role-playing game was set in the same universe.  Both the books and the game were primarily written by Margaret Weis and Tracy Hickman.

Demon Hunters Role Playing Game: The Demon Hunters Role Playing Game is a role-playing game published by Margaret Weis Productions in 2008.

Things Don't Go Smooth: Things Don't Go Smooth is the third title published for Margaret Weis Productions, Ltd's "Firefly Role-Playing Game".  It utilizes the Cortex Plus system.

Serenity Role Playing Game: Serenity Role Playing Game is a science fiction role-playing game released in 2005 and set in the universe of the movie "Serenity".  It was produced by Margaret Weis Productions, Ltd, and its mechanics were the first iteration of the Cortex System.  It won an Origins Award for best RPG in 2005 and Margaret Weis' license came to an end on January 31, 2011.

Cortex Plus: The Cortex Plus System is a toolkit RPG system that evolved from Margaret Weis Productions, Ltd's Cortex System.  It has been used for four published games and one published preview to date, and the design principles are in the Cortex Plus Hacker's Guide, a book of advice in how to create new games using Cortex Plus, and list of new games produced via kickstarter.  According to the Hacker's Guide there are three basic 'flavors' of Cortex Plus; Action, Drama, and Heroic.

Supernatural Role Playing Game: The Supernatural Role Playing Game is a role-playing game by Margaret Weis Productions that was released in 2009.  It is based on the television series "Supernatural" and was the final game to use the Cortex System.

Cortex System: The Cortex System is a generic RPG system based on the "Sovereign Stone System ", and was developed by Margaret Weis Productions, Ltd for the Serenity Role Playing Game.  It was subsequently used for their licensed "Battlestar Galactica" and Supernatural RPGs, and brought out as a stand-alone system in the "Cortex System Role Playing Game" book (also called the "Cortex Classic System Role Playing Game").  Serenity, using the Cortex System, was the 2005 Origins Award Gamer's Choice Role Playing Game of the Year.

Marvel Heroic Roleplaying: Marvel Heroic Roleplaying (MHRP), is the fourth role playing game set in the Marvel Universe, published Margaret Weis Productions under license from Marvel Comics.  It was a fast playing game using the Cortex Plus system, with the first volume published in early 2012.  In early 2013 Margaret Weis Productions announced they would not be renewing their license.

Battlestar Galactica Role Playing Game: The Battlestar Galactica Role Playing Game is a role-playing game published by Margaret Weis Productions in 2007.

Firefly Role-Playing Game: The Firefly Role-Playing Game is a science fiction role-playing game released in 2014 and set in the universe of the Joss Whedon television show "Firefly".  It was produced by Margaret Weis Productions, Ltd, and uses the "Cortex Action" variant of Margaret Weis Production's proprietary Cortex Plus game system.

Supporting paragraphs: Cortex System Serenity Role Playing Game
Answer: 2005