Question: Which American actor guest starred in the nineteenth episode of the sixth season of Futurama?

Documents:
source: Ghost in the Machines
text: Ghost in the Machines "Ghost in the Machines" is the nineteenth episode of the sixth season of the animated sitcom "Futurama", and originally aired June 30, 2011, on Comedy Central. It aired as the third episode of season 6-B, sixteenth in broadcast order for season 6 overall. The episode was written by Patric M. Verrone and directed by Ray Claffey. American actor Dan Castellaneta guest stars in the episode, voicing the Robot Devil. In the episode Bender, angry at Fry for valuing human life over robot life, kills himself in a suicide booth. Afterwards, he becomes a ghost, and learns from the Robot Devil that he is in limbo, and he cannot leave. Sharing a mutual dislike towards Fry, the Robot Devil offers to return Bender to his old body in exchange for using his new ghostly powers to scare Fry to death.

source: Dan Castellaneta
text: Dan Castellaneta Daniel Louis Castellaneta ( ; born October 29, 1957) is an American actor, voice actor, comedian and screenwriter. Noted for his long-running role as Homer Simpson on the animated television series "The Simpsons", he also voices many other characters for the show, including Abraham "Grampa" Simpson, Barney Gumble, Krusty the Clown, Sideshow Mel, Groundskeeper Willie, Mayor Quimby and Hans Moleman.

source: Open and Shut (House)
text: Open and Shut (House) "Open and Shut" is the nineteenth episode of the sixth season of the American medical drama "House" and it is the 129th episode overall. It is directed by Greg Yaitanes and written by Liz Friedman and Sara Hess. It originally aired on April 26, 2010.

source: The Black Fairy
text: The Black Fairy "The Black Fairy" is the nineteenth episode of the sixth season of the American fantasy drama series "Once Upon a Time", which aired on April 30, 2017. In this episode, The Black Fairy's origins and the secret that she kept from Rumplestiltskin are revealed in the present day as Gold takes Emma and Gideon inside the dream world to seek out the truth, while Regina helps Zelena adjust to a normal life without her magic.

source: List of Futurama episodes
text: List of Futurama episodes The American animated science fiction sitcom "Futurama", created by Matt Groening for the Fox Broadcasting Company, aired on Fox from March 28, 1999, to August 10, 2003; Cartoon Network's Adult Swim aired reruns of the show from 2003 through 2007. Following a commitment from 20th Century Fox Television to produce four straight-to-DVD "Futurama" films, Comedy Central announced on June 23, 2006 that they were resurrecting the show and would air the films as new "Futurama" episodes (reconfiguring each film into four episodes) after each film's DVD release. Comedy Central began airing "Futurama" reruns in January 2008 and broadcast on March 23, 2008. Following the four films (considered the fifth season of the show), Comedy Central has broadcast a sixth season of twenty-six episodes, split over 2010 and 2011. A seventh season was announced in March 2011 and debuted in the summer of 2012.

source: We All Deserve to Die
text: We All Deserve to Die "We All Deserve to Die" is the 130th episode of the ABC television series "Desperate Housewives". It is the nineteenth episode of the show's sixth season and aired on April 18, 2010. This episode garnered 10.62 million viewers according to Nielsen Media Research, making this episode the least watched of season six and also the lowest rated episode of the season.

source: Neutopia (Futurama)
text: Neutopia (Futurama) "Neutopia" is the twentieth episode of the sixth season of the animated sitcom "Futurama", and the premiere of Season 6-B. It is the twentieth episode of the sixth season in production order, and the 108th episode in broadcast order. It aired on Comedy Central in the United States on June 23, 2011.

source: Game Changer (Modern Family)
text: Game Changer (Modern Family) "Game Changer" is the nineteenth episode of the first season of "Modern Family" and the nineteenth episode of the series overall. It premiered on ABC on March 31, 2010. The episode's teleplay was written by Joe Lawson & Alex Herschlag from a story by Vanessa McCarthy & Joe Lawson. It was directed by Kevin Sullivan.

source: Is That You? (Adventure Time)
text: Is That You? (Adventure Time) "Is That You?" is the nineteenth episode of the sixth season of the American animated television series "Adventure Time". The episode was written and storyboarded by Jesse Moynihan, from an outline by Pendleton Ward, Adam Muto, Kent Osborne, and Jack Pendarvis. The episode debuted on November 25, 2014, the second episode to air as part of Cartoon Network's "Corn-Ooo-Copia", a week of new "Adventure Time" episodes. It guest stars both Kumail Nanjiani as Prismo and Ron Perlman as The Lich.

source: Grill, Interrupted
text: Grill, Interrupted "Grill, Interrupted" is the nineteenth episode of the sixth season of the American sitcom "Modern Family", and the series' 139th episode overall. It originally aired on April 1, 2015. The episode was written by Paul Corrigan & Brad Walsh & Jeffrey Richman, and directed by James Bagdonas.

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Answer: Dan Castellaneta