Question: Which two companies produced the 2006 film directed by Guillermo del Toro?

Context paragraphs:
The Shape of Water (film): The Shape of Water is a 2017 American romantic fantasy film directed by Guillermo del Toro and written by del Toro and Vanessa Taylor.  The film stars Sally Hawkins, Michael Shannon, Richard Jenkins, Doug Jones, Michael Stuhlbarg, and Octavia Spencer.  It was screened in the main competition section of the 74th Venice International Film Festival and premiered on August 31, 2017, where it was awarded the Golden Lion for best film in the competition.  It also screened at the 2017 Toronto International Film Festival.  "The Shape of Water" has been met with high praise from critics, with many declaring it Del Toro's best film since "Pan's Labyrinth" and particularly praising Sally Hawkins' performance.  It is scheduled for release in the United States on December 8, 2017.

The Devil's Backbone: The Devil's Backbone (Spanish: El espinazo del diablo ) is a 2001 gothic horror film directed by Guillermo del Toro, and written by del Toro, David Muñoz, and Antonio Trashorras.  It was independently produced by Pedro Almodóvar, and filmed in Madrid.

The Strain (TV series): The Strain is an American horror drama television series that premiered on FX on July 13, 2014.  It was created by Guillermo del Toro and Chuck Hogan, based on their novel trilogy of the same name.  Carlton Cuse serves as executive producer and showrunner.  Del Toro and Hogan wrote the pilot episode, "Night Zero", which del Toro directed.  A thirteen-episode first season was ordered on November 19, 2013.  The pilot episode premiered at the ATX Television Festival in Austin, Texas, in early June 2014.

Sundown (video game): Sundown (also known as Guillermo del Toro's Sundown) is an unreleased video game that was under development by Terminal Reality for the PlayStation 3 and Xbox 360.  Not much is known about the game, except that film director Guillermo del Toro was co-developing the game, and it would take place in a world where the players would have to survive an apocalypse while fighting against zombies.  According to del Toro, the game would have been similar to "Left 4 Dead".

Guillermo del Toro's unrealized projects: The following is a list of unproduced Guillermo del Toro projects in roughly chronological order.  During his decades-long career, Mexican film director Guillermo del Toro has worked on a number of projects that never progressed beyond the pre-production stage.  Some of these projects fell into development hell and are presumably canceled.

Guillermo del Toro: Guillermo del Toro Gómez (] ; born October 9, 1964) is a Mexican-American film director, screenwriter, producer and novelist.  In his filmmaking career, del Toro has alternated between Spanish-language dark fantasy pieces, such as the gothic horror film "The Devil's Backbone" (2001), and "Pan's Labyrinth" (2006), and more mainstream American action movies, such as the vampire superhero action film "Blade II" (2002), the supernatural superhero film "Hellboy" (2004), its sequel "" (2008), and the science fiction monster film "Pacific Rim" (2013).  His latest film, "The Shape of Water", won the Golden Lion at the Venice Film Festival and is scheduled for an American release on December 8, 2017.

Hellboy II: The Golden Army: Hellboy II: The Golden Army is a 2008 American supernatural superhero film based on the fictional character Hellboy created by Mike Mignola.  The film was written and directed by Guillermo del Toro and is a sequel to the 2004 film "Hellboy", which del Toro also directed.  Ron Perlman reprises his starring role as the eponymous character.  "Hellboy II: The Golden Army" was released by Universal Pictures.  Unlike the first film, which featured a darker, gothic atmosphere, the film features a fantasy atmosphere.  The film grossed over $160 million, against a budget of $85 million.  It received positive reviews from critics, which praised the fantasy atmosphere in the film, as well as Perlman and the other cast's acting performances.

Pacific Rim (film): Pacific Rim is a 2013 American science fiction monster film directed by Guillermo del Toro and starring Charlie Hunnam, Idris Elba, Rinko Kikuchi, Charlie Day, Burn Gorman, Robert Kazinsky, Max Martini and Ron Perlman.  The screenplay was written by Travis Beacham and del Toro from a story by Beacham.  The film is set in the future, when Earth is at war with the Kaiju, colossal monsters which have emerged from an interdimensional portal on the bottom of the Pacific Ocean.  To combat the monsters, humanity unites to create the Jaegers, gigantic humanoid mechas each controlled by at least two pilots, whose minds are joined by a mental link.  Focusing on the war's later days, the story follows Raleigh Becket, a washed-up Jaeger pilot called out of retirement and teamed with rookie pilot Mako Mori as part of a last-ditch effort to defeat the Kaiju.

Doña Lupe: Doña Lupe is a 1985 short horror film written and directed by Guillermo del Toro.  It is del Toro's ninth short film, though the first eight remain unreleased.  Del Toro filmed "Doña Lupe" at 19 years of age; reviewers have noted that the film "feels like the work of an amateur artist getting to grips with his craft".

Pan's Labyrinth: Pan's Labyrinth (Spanish: El laberinto del fauno , 'The Labyrinth of the Faun' ) is a 2006 Spanish-Mexican dark fantasy film written and directed by Mexican filmmaker Guillermo del Toro.  It was produced and distributed internationally by Esperanto Filmoj and Warner Bros.

Supporting paragraphs: Guillermo del Toro Pan's Labyrinth
Answer: Esperanto Filmoj and Warner Bros.