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Fanfic / The Serpentís Vow

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The Serpent’s Vow is a crossover fanfic of Yu-Gi-Oh! & Stargate SG-1 written by Rahar_Moonfire.

While at a technology and gaming convention in Seattle, Yugi and Joey ask Seto Kaiba for help in retrieving Honda, who has been kidnapped and brainwashed into the cult of Seth Fargough. Unbeknownst to either Yugi or Joey, Seth and Seto have ancient and unpleasant history together. Things only get more complicated when a certain wormhole-traveling military team get involved...


Aside from a few backstory changes (the most notable being that Seto Kaiba is and always has been a Goa’uld), the fic is otherwise (mostly) canon compliant up to the events of Duelist Kingdom and "Seth", at which point things start diverging.

Also has a pseudo-Sequel, Dragons of Atlantis, which is a fusion fic of Stargate Atlantis and the Doma arc of Yu-Gi-Oh!, as well as The Serpent's Reflection, which is told from the perspective of Dr. Samantha Carter after the fanfic's version of the events from "Point of View". The Serpent’s Vow can be found here and here.


The Serpent's Vow contains the following tropes:

  • Adaptational Backstory Change: Seto Kaiba is changed from being an orphan who was adopted by the CEO of a weapons manufacturing company along with his brother to being a 5,000 year old Goa'uld Queen who aided the Pharoah in driving the Goa'uld off the Earth, who was later adopted by the CEO of a weapons manufacturing company along with another kid from the orphanage.
  • Adaptational Badass: Downplayed with Seto, who has several thousand years' worth of various martial arts experience.
  • Adaptational Jerkass: Joey's mother comes across as this, having willingly left Joey in the care of his alcoholic father.
  • Adaptational Nationality: Katsuya "Joey" Jonouchi is half-Japanese/half-American.
  • Adaptation Dye-Job:
    • O’Neill’s eyes are described as being green rather than brown.
    • Pegasus's hair is referred to as "white". In canon, it's grey.
  • Adaptation Expansion:
    • Walter Harriman's family is a little more fleshed out here, building on what little information was provided about them. His sons—one of whom wants to be a dancer on Broadway, the other wants to join the military—are named Andrew and Mark; both are around sixteen years old. His wife is named Charlotte.
    • Isis and Osiris are given slightly more development; Isis in particular is described as being something of a scientist, conducting experiments similar Nirrti's.
  • Adaptation Name Change: Subverted, Nepethys was merely an alias that Seto used and never was his real name.
  • Adaptation Species Change: Seto Kaiba is a Goa'uld. In canon, he was human.
  • Adapted Out: Zorc Necrophades appears to be absent, his role as a backstory antagonist is replaced by Ra specifically and the Goa'uld in general.
  • Adult Fear: Seto was implanted into his current and only host when both he and the host were infants, a fact that horrifies Jacob Carter as he imagines a similar scenario happening to a newborn Sam.
  • Anachronism Stew: Mostly averted, although Joey derisively refers to a cultist as "Magic Mike" in 1999.
  • Ascended Extra: In canon, Walter Harriman rarely did anything besides dialing the Stargate. Here he is either the focus of or a major player in several scenes, up to and including intervening in the possessed Joey-vs.-Yugi duel.
  • Asskicking Equals Authority: Thanks to a combination of his luck and fighting skills, Joey is made Seto’s first prime.
  • Backup Bluff: Seto boasts to Seth that he’s been building an army over the past five thousand years (when no such army exists), and that SG-1 are a part of said army.
  • Bad to the Last Drop: Seto thinks that the SGC's coffee is awful. He drinks it anyways.
  • Bizarre Alien Biology: According to Seto, the Furlings synthesized Orichalcum in much the same manner as the Goa'uld synthesize Naquadah.
  • Born Lucky: Joey.
  • Casting a Shadow: Seto uses the Millennium Rod to control Shadows.
  • Clingy Macguffin:
    • Seto notes that no matter how often he threw the Millennium Rod away, it always found its way back to him.
    • Ishizu admits that not long after earning the right to wear the Millennium Tauk she buried it in the sand not far from her home, only to find it the ground near her bedroom door when she went to bed later that night.
  • Composite Character: Set and Seto are the same person.
  • Cool Big Bro: Mokuba thinks of Seto as this, even when he realizes that Seto isn’t human.
  • Cool Bike: Seto’s bike has a biometric lock that will electrocute anyone unfortunate enough to try to tamper with it.
  • Crossover: Between Yu-Gi-Oh! and Stargate SG-1.
  • Death by Adaptation: Yugi's father is mentioned in passing as being deceased.
  • Dies Differently in Adaptation:
    • In canon, Gozaburo Kaiba commits suicide by jumping out of a window. Here it initially seems like he dies the same, only for it to be strongly implied that Seto used his Shadows to push Gozaburo out the window.
    • In canon, Mr. Ishtar dies either from being skinned alive by Yami Malik (manga) or being stabbed to death by Yami Malik with the Millennium Rod (anime). Here, since Seto has been in possession of the Millennium Rod for the past five thousand years, Mr. Ishtar instead dies when a Goa'uld-possessed Malik throws him into a wall, breaking his spine and shattering his skull in the process.
  • Eunuchs Are Evil: Heur'ur, since Seto cut off the former’s penis at some point during the Goa’uld occupation of Earth for trying to make Seto his breeding queen.
  • Fusion Fic: Osiris takes on the role originally fulfilled by Yami Malik.
    • Atem was the Pharoah who led the uprising against Ra.
  • Groin Attack: SG-1 all find it amusing when they learn what Seto did to Heru'ur, but Jack in particular is still uncomfortable at the imagery.
  • Ignorant of Their Own Ignorance: Seto was unaware of the existence of the Tok'ra, the Protected Planets Treaty, and the death of Ra until he met General Hammond. On a personal note, he also believed that it was impossible for the host's mind to survive implantation simply because his own host has no consciousness of its own, when that is actually due to him being implanted so young that his host never had the chance to develop its own identity.
  • In Memoriam: Chapter 29 (First Prime and Chevron Guy) is dedicated to the memory of Jacob Carter/Selmak’s actor Carmen Argenziano, who passed away around the time the chapter was published.
  • Named by the Adaptation:
  • Noble Bird of Prey: Neith, whose host is a white-tailed kite.
  • Patchwork Fic: The fic seems to be set in a fusion of the manga and the Sub continuity of Yu-Gi-Oh! (there's a remark about the time that Shadi rearranged Anzu's soul room and Yugi is taken to the hospital because of a warehouse fire caused by Bandit Kieth). Additionally, the Shadow Realm is referenced as being the place Duel Monsters are summoned from, and several characters (Serenity Wheeler, Katsuya "Joey" Jonouchi, Isono Roland and Saruwatari Kemo) have names that are either fully or partially the versions they had in the Dub.
  • Reincarnation: Aside from being reincarnated into Ishizu Ishtar, priestess Isis has been reincarnated at least two other times to her knowledge.
  • Related in the Adaptation: The Goa'uld queen that spawned Seto is none other than Isis.
  • Shout-Out:
    • When Joey first learns about the Goa'uld, he compares Set to the Yeerks from Animorphs.
    • Joey asks if the wormholes generated by the Stargate are similar to the ones featured on Farscape.
  • Take a Third Option: The entrance of SG-1 into Setesh's compound gives Seto a chance to do this, the other two options being submitting himself willingly to Setesh (keeping his host in the process) or refuse and lose his host.
  • Undying Loyalty: Seto is this towards his Pharoah.
  • Unrelated in the Adaptation: Seto isn't biologically related to Mokuba in this fic. It doesn't stop them from loving each other as if they were, however.


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