Contributors included Mike Birbiglia, Starlee Kine, Dan Savage, David Rakoff, and Joss Whedon. The season also featured guest directing courtesy of Joss Whedon and J. J. Abrams. He was played by Nathan Fillion in Joss Whedon's 2012 film version. Numfar is a cameo appearance by Joss Whedon. Jed, Joss, and Zack Whedon all provide the singing voices of Bad Horse Chorus. The screenplay was written by Simon Moore but includes contributions from Joss Whedon. Holkenborg was later replaced by Danny Elfman, brought up by Joss Whedon. Serenity is a 2005 American space Western film written and directed by Joss Whedon. Tudyk was cast as a special guest star in Joss Whedon's "Dollhouse". The film was written and directed by Joss Whedon. He got the "Buffy" job based on Gellar's recommendation to the show's creator, Joss Whedon. Several colleagues of Joss Whedon have cameo roles in the series. Equality Now, a human rights organization supported by Joss Whedon. Johansson reprised the role in the Joss Whedon-directed "The Avengers" in 2012. The episode was the first to be directed by Joss Whedon.