Original: All nine principal cast members from the television series (Adam Baldwin, Alan Tudyk, Gina Torres, Jewel Staite, Morena Baccarin, Nathan Fillion, Ron Glass, Sean Maher, and Summer Glau) returned for the movie.
Simplified: All nine of the main actors from the television series (Adam Baldwin, Alan Tudyk, Gina Torres, Jewel Staite, Morena Baccarin, Nathan Fillion, Ron Glass, Sean Maher, and Summer Glau) returned for the movie.