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- Dan Castellaneta as Homer Simpson and Additional Voices
- Julie Kavner as Marge Simpson
- Nancy Cartwright as Bart Simpson, Maggie Simpson and Additional Voices
- Yeardley Smith as Lisa Simpson
- Harry Shearer as
- Hank Azaria as
- Benedict Cumberbatch as Marutas, a "terrifying alien warrior with plans for Earth". Jackson stated that Cumberbatch was his "first and only" choice for the role. Elaborating, he stated that "Benedict brought the perfect energy to the role; he had to sound refined but brutal. You had to get the sense you'd be intimidated by him.". On the character, Cumberbatch said, "He's very determined. He's not brutish, however. He's intelligent but vicious; the sort of guy who speaks at length with someone before killing them.". Cumberbatch also said that there was "a lot of comic relief to Marutas", but the character was not aware of it.
- Chris Pratt as Dan, a mechanic at the base who befriends Bart and Lisa. Jackson commented after reading the script; "This guy is so Chris Pratt". Pratt commented "When I came into the recording room, I asked Nathan Jackson what he wanted me to do. He looked at me, like I had gone crazy and said 'Do what you always do!".
- Bryce Dallas Howard as Natalie, a lab-tech at the base. Howard was cast because of Nathan Jackson watching her in Jurassic World and the repartee she had with Chris Pratt in that film.
- Stephen Fry as Artuke, an "enigmatic alien guide whose motives may not be all they appear". Jackson wrote the film's dialogue specifically with Fry in mind for the role. Fry commented, "It was a very difficult role to do. You had to bring the right energy to the role; the voice had to be very enigmatic, but sound trustworthy at the same time. You had to understand why you would trust him."
- Christoph Waltz as Dr. Hans Jurgen, a scientist at the base. Of his character, Waltz stated, "He's very fussy. He's absentminded, and blusters quite a bit. He's the classic absent-minded professor sort of character" Since the character interacts with Homer a lot, Nathan Jackson had Dan Castellaneta and Christoph Waltz record their lines together; meaning that a lot of their dialogue was improvised. Waltz commented "My character bonds with Homer a lot and we end up forming this sort of Odd Couple dynamic - I'm the neat freak and he's the slob!"
- Toby Kebbell as TBA
- Ron Perlman as TBA
Jackson and Gilmore.At S89 Expo, Jackson and Gilmore confirmed the possibility of at least two more sequels, each based on a genre of film. Jackson commented they were searching for ideas for the sequel, but they were thinking around the idea of "a alien movie", but a movie that moved away from the classic "flying saucer" aspect of aliens. Of the films, Raising the Past was supposed to be the "classic science-fiction story" of the four films, with House of Horrors being the "gothic horror", being the "monster film" and Dragonhunters being the "fantasy film".
In June 2012, Nathan Jackson gave details about the film's plot: "The film's sort of a science-fiction story, set in Antarctica. It's about Homer accepting a posting to Antarctica and the Simpsons end up in this base, where a chain of events leads to them encountering these two warring factions of aliens, which both have their own plans for Earth..." One of Jackson and Gilmore's intentions was to explore what aliens represent in film. Nathan Jackson said: "It's time to do a movie where you get to see what would really happen if aliens landed on Earth; if we encountered aliens." Influences included Stargate, Chariots of the Gods and the works of H.P.Lovecraft. At the S89 Expo it was announced that Toby Kebbell (who voiced Redcap), Steve Zahn and Christoph Waltz had joined the cast of the film.
The decision to set the film in Antarctica came about because "House of Horrors worked because it was set in a very restricted location; so we needed to get that, but on a much grander scale. If you set it in Antarctica, which is pretty much as isolated as you can get, it gives that restricted feel".
|"This is a very Lovecraftian film. There's a lot of other influences; von Daniken, John Carpenter, but, at its core, the themes and the general plot of the story is influenced by Lovecraft."|
|— Nathan Jackson, talking about the tone for the film|
In June 2015, it was announced that there had been major cast and script revisions. It was revealed that Steve Zahn had been replaced by Chris Pratt, and Toby Kebbell had been replaced by Benedict Cumberbatch, (Kebbell would be recast in a smaller role and Zahn would later be cast in Dragonhunters). Stephen Fry and Bryce Dallas Howard were also announced to voice unspecified characters. On the cast revisions, Jackson explained ""There was a delay, because we felt we needed to change the script, really, it was really about the themes of the film, so that we could push the ideas we were trying to infer. Then everything else, all the other characters that supported that story came in and out and changed and evolved and through that evolution, some of those performers changed out of it."
For the Ferox and Aeros, Jackson wanted to create creatures that had never been seen in film before. In order to achieve this, Nathan Jackson visited biologists Curtis Clark and David Moriarty in order to figure out what an extraterrestrial lifeform might look like. The aliens (codenamed EBE-1) were also designed via input from artists Joschua Knuppe and C.M. Kosemen. Jackson stated "We wanted them to seem essentially outlandish in a way, but on the other hand you could sort of imagine them existing: you feel like they could really exist... So to take an outlandish design and then render it with an attention to real animal anatomy and detail is interesting."
The Ferox had to be designed to look like "the ultimate predators", so features from various animals were incorporated; polar bears were looked at for the color scheme and body design. In order to observe how they would move, the designers looked at linebackers for motion reference. Their tattoos are based on Samoan and Maori tribal tattoos and allowed the designers to differentiate each character.
As a classic science-fiction story, Raising The Past focuses on an ancient war between two equally ancient species, which subsequently gains new weight as our own main characters enter the ordeal.
The film's score is being composed by Steve Jablonsky. This will make his first animated film.