Star Fox: Assault's development began with its Battle Mode, which explains why it was the first and only feature shown off at its E3 2003 showing. The battle mode in Star Fox 64 was merely just a last-minute bonus, so Takaya Imamura had desired to create a more fleshed out version in a future Star Fox title. This is where Namco handed Nintendo a couple of design documents patented as "Vehicle-Swapping War Action Game", and that's what would be the starting point for Assault's development.

It seems that work on the single-player mode didn't really begin until midway into development. Apparently, as the development team had focused so much of their energy into Star Fox: Assault's battle mode, there were serious talks to abandon the single-player aspect entirely and just make the title a pure multiplayer game. Of course, the development team recognized that many fans would wanted a proper story mode, so they pushed forward on it. Assault's director Toshiyuki Nakanishi explains that this is why the game had a lengthy development cycle.

Leon and Panther are voiced by David Scully, who is best known for voicing Sergeant Johnson from the Halo series and Dimitri from Sly Cooper. Like most other Star Fox Assault voice actors, he was unable to reprise his characters' roles in Super Smash Bros. Brawl.

Most of the music heard throughout the game are tracks from Star Fox 64 redone in higher quality. The one noticeable exception is Fortuna, which is a heavily orchestrated original track. No Star Fox Adventures music was reused however, despite the Walled City returning and despite Nintendo owning the rights to that game's soundtrack following Microsoft's acquisition of Rare.

There is an unused game over theme in the game's data that resembles the game over theme from Star Fox 64.

In the cinematic that plays after defeating now former Star Wolf member Andrew Oikonny, a strange aparoid appears firing a beam at one of the characters. In the Japanese version it's done to Slippy, whilst in the Western versions it's done to Krystal.

On the Japanese website for Star Fox 64, Slippy mentions certain background characters who would appear in future installments:

• Peppy's wife, Vivian Hare. According to Slippy, Peppy took her to planet Zoness for their honeymoon, which explains why Peppy is so distraught at its polluted status in SF64. Vivian would appear in-game for the first time in Star Fox Command, where it's revealed that she and Peppy had a daughter named Lucy, and that Vivian had died of a disease several years prior.

• Slippy's father, Beltino Toad. According to Slippy, Beltino works as an engineer for Space Dynamics, the manufacturer of the Arwing and many of the other vehicles the Star Fox team utilize. Beltino would later appear in-game for the first time in Star Fox Assault, and would later appear in Star Fox Command.

It's worth pointing that unlike Vivian, Beltino was mentioned in western ancillary SF64 material, that being both the official western Star Fox 64 website and the Star Fox 64 Official Player's Guide, where it states that he helped his son Slippy create the Blue Marine.

Outside of the SNES titles, Star Fox Adventures is the only Star Fox game on a home console to not feature any sort of Japanese voice acting, instead relying on Japanese subtitles for its localization in Japan. This is because Rare preferred to use their in-house staff for voicing characters in their games, rather than having to travel over to London to find professional voice actors.

Since Krystal and Tricky are the only new characters introduced in SFA to reappear in future games such as Star Fox Assault and the Super Smash Bros. series, they are the only Dinosaur Planet/Star Fox Adventures characters to ever have any Japanese voice work done for them, with Krystal being voiced by Teiya Ichiryusai and Tricky being voiced by Hirohiko Kakegawa. Ichiryusai would reprise her role as Krystal in Super Smash Bros. Brawl, with her voice clips being reused for Super Smash Bros. for Nintendo 3DS, Super Smash Bros. for Wii U, and Super Smash Bros. Ultimate.

Star Fox Adventures primarily takes place on a planet filled with dinosaurs known simply as "Dinosaur Planet". It would return or be referenced in future games like Star Fox Assault and Star Fox Command, as well as "Star Fox Zero - The Battle Begins", a promotional anime released to commemorate the release of Star Fox Zero, but it would instead be referred to with a different name: "Sauria".

It turns out Rare had always intended Dinosaur Planet's real name to be Sauria, as leaked voice clips from the implied climax of the original Nintendo 64 Dinosaur Planet feature the Krazoa name dropping it as they begin the alignment of the "Majestic Eight" planets to wreak havoc on the universe using the power of their god, the Quan Ata Lachu. An edition of "Ask Uncle Tusk" on Rare's old website revealed Dinosaur Planet's name to be Sauria as well.

The official Japanese Star Fox 64 guidebook reveals that Andrew Oikonny was essentially forced onto the Star Wolf team purely out of nepotism on Andross' part, and that he was actively disliked by his teammates due to his poor piloting skills and also massive ego in regards to his relationship with Andross. Effectively, the only reason Wolf put up with him during the events of Star Fox 64 was due to the fact that he was using said connections to Andross to provide his team with immeasurable technological and financial backup.

A timeline of events provided in Star Fox Command's official guidebook claims that after Andross' defeat at the end of SF64, the Star Wolf team moved away from the Venom army effective immediately and in turn kicked out Andrew, who no longer had the support of his now deceased uncle, hence why at the beginning of Star Fox: Assault, he's on his own trying to rebel against Corneria using the remnants of Andross' forces.

In the Japanese version of Star Fox Adventures, some of the dinosaur tribes have different localized names from their original names. For example, the CloudRunners are referred to as the クラウド族 (Kuraudo-zoku), which translates to "Cloud Tribe". The EarthWalkers are referred to as the アソーカ族 (Asōka-zoku), which strangely seems to directly translate to "Ahsoka Tribe". It's worth noting that the direct translation for "EarthWalker" in Japanese is アースウォーカー (Āsu-Wōkā); it's possible that アソーカ (Asōka) is meant to be a shortened, phonetic play on it, perhaps as the original name, directly translated, would be too difficult for Japanese audiences to pronounce.

In Star Fox: Assault's Sauria mission, Peppy curiously refers to the CloudRunner Tribe as just "the Cloud Tribe". This makes more sense when you factor in that that's what they're called in the Japanese version of Star Fox Adventures and thus was what the original script writers for Assault in Japan used as a frame of reference, and it appears that whoever was localizing the script for western audiences didn't bother to change it back to the original Rare name.

Funny enough, in Star Fox Command, Krystal pilots a spacecraft that is both shaped and named after the CloudRunners. In the Japanese version, it actually retains that name, クラウドランナー (kuraudorannā), which means that Command marks the first time Rare's original CloudRunner name was utilized in the Japanese version of these games.

In Japan, Slippy Toad's father, Beltino, is called ベルツィーノ(Berutsīno) which comes from ベルツノガエル (Berutsunogaeru), meaning Bert's frog or Belted frog. This is also the Japanese name for the Argentine horned frog, better known as a Pacman frog. Funny enough, after being alluded to on the Japanese Star Fox 64 website, Beltino would go on to have a major role in Star Fox: Assault, which was developed by Namco, the creators of Pac-Man.

Star Fox, Star Fox 64 and Star Fox Adventures are the only Star Fox titles to provide official ages for the main characters, primarily within their Japanese ancillary material. In the Original Soundtrack box released for the first game, Fox, Falco, Peppy and Slippy are said to be 25, 28, 36 and 19 respectively. Star Fox 64, being a remake of the first game, would retcon these ages and make Fox 18, Falco 19, Peppy 41 and Slippy 18.

The "Farewell Beloved Falco" midquel manga, which is set right in the middle of the eight years between Star Fox 64 and Star Fox Adventures, also gives the original Star Fox crew ages, with Fox now being 22, Slippy 22, Falco 23, and Peppy 45.

Star Fox Adventures takes place eight years after Star Fox 64, which means that Fox is now 26, Falco 27, Peppy 49 and Slippy 26. Japanese Star Fox Adventures ancillary material also reveals Krystal's age to be 19, making her distinctly the only Star Fox character outside of the original four Star Fox members to have a known age. Going by this, she would be 11 and 15 years old during the events of Star Fox 64 and Farewell Beloved Falco, respectively.

After Adventures' release, Nintendo, specifically Takaya Imamura, made a deliberate decision for future Star Fox games to not provide any official age numbers for any of the characters. However, Star Fox Assault officially is said to take place only year after the events of Star Fox Adventures, so this would make Fox 27, Falco 28, Peppy 50, Slippy 27, and Krystal 20. Similarly, according to Takaya Imamura in a 2007 interview, Star Fox Command takes place 2-3 years after Assault, which would make Fox 29-30, Falco 30-31, Peppy 52-53, Slippy 29-30, and Krystal 22-23.

Although Wolf O'Donnell has never had any age officially listed for him, Takaya Imamura implied on Twitter that he is within the same generation of Peppy and James.

The climax of Star Fox Assault sees the Great Fox, the Star Fox team's mothership and home base, destroyed in battle against the Aparoids. This is why in the next installment, Star Fox Command, it's been replaced with a smaller space carrier.

According to Takaya Imamura in a 2011 Nintendo Dream magazine interview, this particular model the Star Fox team rented is a common battleship type, which actually explains why other characters that appear throughout the story, such as Wolf and Lucy, are shown to have their own ships of the same model.

At the beginning of Star Fox: Assault, Andrew Oikonny's rebellion is seen to be utilizing three models of humanoid mechas, which, going by the official Japanese guidebook for Star Fox: Assault, seem to be known as サルデス (Sarudesu). This can be transliterated as "Sardes".

• サルデス MK III S (this seems to be a prototype, judging by Fox's comments. It later appears infected by the Aparoids.)
• サルデス MK III DB
• サルデス MK III DG

These are actually meant to represent evolved forms of the Shogun Warriors featured near the end of Star Fox 64's Sector Y stage, who too in the Japanese version of SF64 are referred to as サルデス (Sarudesu). What is called the Shogun Lord in the English version of the game is also called サルデスII (Sarudesu II) in the Japanese version.

As サル (Saru) is the Japanese word for monkey, and デス (Desu) means death, the literal translation of the name in English should be "Monkey Death".

All in all, it would seem that the entire Star Fox chronology, at least as it was presented from Star Fox 64 to Star Fox Command, spans roughly 20 years.

Star Fox 64's whole backstory take place across 10 years, beginning with Andross' banishment to Venom and then James' death/betrayal on Venom five years later, and the events of Star Fox 64 taking place another five years later after that. The Japan-only "Farewell Beloved Falco" Manga, the canonical manga follow up to Star Fox 64 and prelude to Star Fox Adventures, would take place four years later, and SFA would take place another four years later after that. Star Fox Assault takes place one year after the events of SFA, and Star Fox Command was said to take place a vague 2-3 years after the events of Assault. This would amount to overall roughly 21-22 years.

The English manual and prologue for Star Fox Adventures implies a bigger backstory for Krystal, in that she's the sole remaining survivor of her doomed home planet, "Cerinia", and that she's been roaming the galaxy in search of answers for the truth of her family's death, until she receives a distress call from Dinosaur Planet. With how the manual states that Krystal "may finally be drawing closer to the truth" behind her parents' and planet's destruction, it seems Rare was loosely implying that Andross, who turns out to be the real villain of Star Fox Adventures and thus the culprit behind Dinosaur Planet's woes, was responsible for Cerinia's destruction. Krystal even says "It's you!" right before Andross imprisons her in the crystal at the top of Krazoa Palace.

However, it would seem the Japanese localization for Star Fox Adventures would completely eschew this backstory, removing all mention of Cerinia and as well as Krystal's dead parents. The Japanese prologue was even heavily simplified to this:


The Japanese website even states that "it is not known what her purpose is", which flies directly in the face of Rare's original story for her, that explicitly states that she was searching for the truth of Cerinia's destruction. To add more insult to injury, there isn't even any Japanese subtitle presented when Krystal gets knocked into the crystal by Andross in Krazoa Palace.

Curiously, the Japanese localization of Star Fox Adventures also heavily emphasizes Krystal having telepathic abilities, much more so than in the English version. This is noteworthy because neither Star Fox Assault or Star Fox Command, the next two story follows up to Star Fox Adventures that were developed and written in Japan, made any sort of mention of Cerinia. Star Fox Assault however would hugely emphasize her telepathic abilities, and its manual even describe Krystal the same way the Japanese version of Star Fox Adventures does, just as "a mysterious telepathic woman". This also applies to her trophies in Super Smash Bros. Brawl and Super Smash Bros. for Nintendo 3DS and Wii U that once again make no reference to Cerinia. It's very clear that the developers and writers behind Assault, Command and Smash Bros. in Japan were using the Japanese version of Star Fox Adventures as a reference, as opposed to the English version.

All in all, it would seem Nintendo of Japan had their own differing vision of what Krystal's character was from Rare, that being mostly just as a telepathic woman with a mysterious background, as opposed to Rare's original backstory of her being the lone survivor of her kind.

According to the official Japanese Star Fox 64 guidebook, the main driving point for Wolf O'Donnell's rivalry with Fox McCloud is the fact that Wolf was previously rivals with his father, James. This is alluded to in-game with various voice clips from Wolf across Star Fox 64, Star Fox Assault and Star Fox Zero, and it's also reiterated in the timeline of events provided in Star Fox Command's official Japanese guidebook.

As it currently stands, barring Star Fox 64 3D, Macbeth is the only planet from Star Fox SNES and Star Fox 64 to not have reappeared in future games.

•Corneria, Fichina, Katina, and Fortuna would reappear in Star Fox Assault. Titania and Zoness would appear in Star Fox Assault's multiplayer mode as well.

•Corneria, Fichina, Katina, Solar, Aquas, Titania and Venom would reappear once again in Star Fox Command.

•Corneria, Fortuna, Fichina, Zoness, Titania and Venom would also reappear in Star Fox Zero.

Outside of Tricky, the two dinosaur species from Star Fox Adventures that reappear (as corpses infected by the Aparoids) in Star Fox Assault's Sauria mission are of the ThornTail and HighTop tribes.

Strangely, while the ThornTails are mostly faithful enough to their Star Fox Adventures models, the HighTops differ, primarily in skin pattern and coloration, being presented as green in Assault as opposed to yellow/beige in Adventures.

The Landmaster's appearance as Fox, Falco and Wolf's Final Smashes in Super Smash Bros. Brawl and Super Smash Bros. for Nintendo 3DS and Wii U is a composite of its appearances from Star Fox 64 and Star Fox Assault, maintaining the sharp and futuristic appearance it had in the latter, but still retaining traditional tank treads as seen in the former.

This particular design would eventually be implemented into the Star Fox series proper, beginning with the Landmaster's appearance in Star Fox 64 3D, and would be used again in Star Fox Zero.