Introduction: The Enduring Legacy of Fullmetal Alchemist

The quest for the Philosopher’s Stone, the law of Equivalent Exchange, and the unbreakable bond between two brothers – these elements have cemented Fullmetal Alchemist as a cornerstone of anime storytelling. Hiromu Arakawa’s masterpiece, serialized in Monthly Shōnen Gangan from 2001 to 2010, explores deep themes of sacrifice, hubris, war, and redemption. However, encountering the series for the first time presents a unique dilemma. Unlike most anime, Fullmetal Alchemist was adapted twice into full television series, each telling a remarkably different story under the same initial premise. This has spawned a persistent debate among fans: should you start with the older, darker 2003 adaptation, or the more faithful 2009 Brotherhood version? This guide dissects both series, their production histories, thematic divergences, and consequential film continuations, helping you craft the optimal viewing experience.

The Tale of Two Adaptations: Why Two Series Exist

Understanding the watch order requires grasping a fundamental production reality. In 2003, Studio Bones began adapting the manga while it was still being published, with only a few volumes available. Following an initial faithful stretch, the anime quickly caught up to the serialized source material. Rather than inserting endless filler arcs while waiting for Hiromu Arakawa to write more, the studio, with the author’s blessing, chose to deviate drastically. They crafted an original ending, introducing new characters and a different metaphysical explanation for the series’ antagonistic forces. Six years later, with the manga nearing its conclusion, Bones returned to the material. Fullmetal Alchemist: Brotherhood was born, this time committed entirely to a page-to-screen adaptation of the complete, finished manga story.

Fullmetal Alchemist (2003): A Journey into Existential Darkness

Plot Divergence and Original Storyline

The 2003 series begins quite similarly to Brotherhood, covering the Elric brothers’ tragic attempt to resurrect their mother, the resultant loss of Edward’s limbs and Alphonse’s body, and their journey to become State Alchemists. Initial adventures in Liore and encounters with Scar the Ishvalan feel familiar. However, the narrative diverges significantly around the laboratory five arc and introduces entirely anime-original primary antagonists: the homunculi Dante and the gate's thematic purpose shifts. In this version, homunculi are not beings created by a central villain’s philosopher’s stone; they are the result of a failed Human Transmutation, each one a living echo of the alchemist's lost loved one. The concept of Equivalent Exchange is twisted, culminating in a revelation that our world exists on the other side of the Gate, linking alchemy to historical events from Earth’s reality. This inter-dimensional twist leads to a deeply introspective and melancholic conclusion, culminating in the feature film Conqueror of Shamballa.

Thematic Strengths and Emotional Weight

This adaptation excels in atmosphere. It leans heavily into the trauma of the Ishvalan Civil War, front-loading an emotional breakdown for the Flame Alchemist Roy Mustang that creates a more somber, guilt-ridden character from the start. The series spends extended time on the psychological toll of the brothers’ journey. Edward’s survivor’s guilt and Alphonse’s fear regarding the authenticity of his memories are probed with a razor-sharp focus. The homunculi, especially Lust and Sloth, are reimagined as tragic figures whose motivations stem from a yearning for humanity they cannot possess. For viewers who appreciate morally grey endings and a gritty realism where victory is inherently bittersweet, the 2003 series offers a more mature, if less cohesive, narrative. The animation style, character designs, and a haunting orchestral score contribute to a sense of lingering dread.

Fullmetal Alchemist: Brotherhood (2009): The Canonical Epic

Faithful Adaptation and Expanded World-Building

Fullmetal Alchemist: Brotherhood is the definitive, author-intended story. It begins with a brisk recap of the brothers’ early days — some argue too brisk — assuming the audience might already be familiar with the 2003 setup. By episode 13, the narrative enters uncharted territory for those who only watched the first adaptation. The story rapidly expands eastward into the desert nation of Xing, introducing pivotal characters like May Chang and Ling Yao, whose narrative purposes transcend simple allyship. The homunculi are reorganized into a clear hierarchy, each named after the seven deadly sins, and their father figure, the ancient entity Father, serves as the ultimate antagonist. The overarching plot unfolds as a massive conspiracy spanning centuries, culminating in the apocalyptic Promised Day.

Pacing, Action, and Resolution

Where the 2003 series stews in internal conflict, Brotherhood soars with external ambition. It is a war story on a grand scale, mixing high-octane alchemical battles with strategic political maneuvering by Mustang’s unit. The tone balances dark themes with Arakawa’s signature slapstick comedy, creating a rhythm of tension and release that makes the tragic moments hit even harder. The character roster is significantly larger, and every single one, from the Armstrongs to the chimera soldiers, receives a complete arc. The concept of Equivalent Exchange is eventually challenged and evolved through the series’ climax, offering a more hopeful, humanistic resolution: the idea that a life lived for others has value beyond simple transaction. The animation by Bones is fluid and bombastic, particularly during the final arc’s clashes. For many, Brotherhood represents a perfect shonen anime, holding the top spot on anime databases like MyAnimeList for years.

Your viewing order is not complete without considering the ancillary content, which bridges the gaps or extends the stories.

  • Conqueror of Shamballa (2005): This is the direct sequel to the 2003 anime series. It picks up two years after its cliffhanger, with Edward living in 1920s Munich post-World War I, attempting to use rocketry and parallel-world physics to return to Amestris. It concludes the 2003 narrative with a definitive, albeit divisive, resolution. You must watch the 2003 series before this film.
  • The Sacred Star of Milos (2011): A standalone film that sits loosely within the Brotherhood continuity, generally placed during the brothers’ journey before the final arc. It explores a region outside Amestris with its own alchemical traditions. It is not canonical to the manga but features the Brotherhood character designs and voice cast.
  • OVA Collection: Both series produced short original video animations. The Brotherhood OVAs include “The Blind Alchemist,” a touching side story, and “Simple People,” a character-focused vignette. The 2003 OVAs include a live-action segment and comedic shorts. These are non-essential but delightful supplements.

There is no single correct answer, but there is a strategic path for different viewer priorities. Here is the breakdown:

1. The Canon Purist (Complete Story First)

If you value a cohesive, complete narrative that respects the author’s vision exactly, follow this path:

  1. Fullmetal Alchemist: Brotherhood (Episodes 1-64).
  2. Optionally: The Sacred Star of Milos film (if you want more action, set during the late-middle episodes of the show).
  3. Then: Watch the 2003 series as an alternative "what-if" story. This allows you to appreciate the darker re-imagining without confusing the canon’s mechanics.

This order prevents spoilers and confusion about homunculus origins. It gives you the complete, satisfying arc of the manga. This is the recommended order for first-time anime viewers who dislike experimental storytelling.

2. The Emotional Depth Seeker (Chronological Release)

This order treats the 2003 series as a prologue that warms up the world-building and character introductions before the faster-paced Brotherhood takes over:

  1. Fullmetal Alchemist (2003) (Episodes 1-51).
  2. Conqueror of Shamballa film (to close out that timeline).
  3. Fullmetal Alchemist: Brotherhood (Episodes 1-64).

The advantage here is that the 2003 anime lingers on Nina Tucker’s tragedy, Hughes’ family life, and the Ishvalan war flashbacks, giving these events immensely more impact. When you switch to Brotherhood, which rushes these early arcs in about 12 episodes, you carry the emotional weight forward. Crunchyroll streams Brotherhood, enabling an easy binge-watch after processing the 2003 series. The risk is narrative dissonance — the rules of alchemy and homunculi will be entirely rewritten halfway through your marathon.

3. The Hybrid Innovator (The Fan-Edited Cut)

Some dedicated fans advocate a spliced watch order to create the ultimate slow-burn setup. This is complicated but effectively stitches the best pacing of 2003’s beginning onto Brotherhood:

  1. Watch Fullmetal Alchemist (2003) episodes 1-25 (covering up to the return to the Fifth Laboratory).
  2. Switch to Fullmetal Alchemist: Brotherhood episode 8 (or 11, depending on the guide) and watch until the end.

We generally recommend this only for rewatchers. The transition between the two production styles, voice direction, and the abrupt shift in plot threads (like the different generals at Central) can be jarring for newcomers.

Character Deep Dive: How the Versions Shape the Heroes

The soul of Fullmetal Alchemist lies in its cast, and the two series often mold them into distinct people.

Edward and Alphonse Elric

In the 2003 series, Edward is more volatile and emotionally fragile, visibly breaking under the guilt of dragging Al into a broken body. The final arc forces him to make a sacrifice that separates him from his brother, testing the narrative’s central theme of togetherness. In Brotherhood, Ed matures into a defiant tactician who rejects the divine rules forced upon him. He grows not by accepting a cruel universe, but by punching through it with sheer humanistic optimism. Alphonse, conversely, gets a more harrowing identity crisis in 2003, where he questions if his soul is even real. Brotherhood Al is gentler, a moral compass who ironically grounds the team.

Roy Mustang’s Ascent

The Flame Alchemist’s trajectory is vastly different. The 2003 anime frames him as a broken man using revenge as a crutch from very early on, bringing his PTSD to the forefront in a stand-alone encounter with Winry. Brotherhood builds Mustang like a political chess master, hiding a fierce ambition to become Führer behind a lazy facade. His ultimate fate in Brotherhood ties directly to his sins in Ishval and a literal loss of vision, a poetic justice that the 2003 series lacks but which defines his arc in the canon. This version is widely considered one of anime's greatest character studies.

The Homunculi

No shift is more stark. In 2003, Lust and Sloth are tragic mothers seeking humanity. In Brotherhood, they are literal sins: Lust is a lethal weapon, and Sloth is a monstrous muscle machine. The 2003 Pride is King Bradley’s adopted son; the Brotherhood Pride is the shadow-homunculus Selim Bradley. Understanding these differences is critical because watching 2003 first can spoil the shocking betrayal of Father’s identity in Brotherhood while also misdirecting expectations about Envy’s true form, which is revealed to be a tragic, jealous parasite in the 2003 timeline. Anime News Network’s encyclopedia provides detailed breakdowns of these character variations for those seeking a technical analysis.

The Philosophical Core: Equivalent Exchange vs. The Law of Love

Akira Arakawa’s manga drafts a philosophy where Equivalent Exchange is ultimately refuted. The 2003 anime treats Equivalent Exchange as a painful truth, twisting it to ask: can you give something of equal value if what you lost was an irreplaceable human being? It ends with the brothers separated across dimensions, each having given up their world for the other, a classic equal trade. Brotherhood, however, crescendos with Edward Elric rejecting alchemy entirely. He trades his Gate of Truth — his ability to perform alchemy — for his brother’s physical body. The narrative argues that a selfless act of love defies the transactional nature of the universe; you cannot put a price on a human soul. This thematic climax is why many argue that without finishing Brotherhood, you miss the actual point of the story.

Visual and Musical Scoring

The auditory landscape also dictates the viewer’s emotional connection. The 2003 soundtrack by Michiru Oshima is a mix of Slavic folk, sweeping strings, and melancholic piano pieces like “Bratja,” the Russian lullaby that anchors the Elrics’ pain. Brotherhood, composed by Akira Senju, deploys epic orchestral movements fit for a Hollywood war epic. Themes like “Laws of Alchemy” and “Trisha’s Lullaby” evoke a grand, cinematic scale. Similarly, the visual texture differs: the 2003 animation uses darker, earthier colors with a film grain that adds weight, while Brotherhood is digitally crisp, brighter, and utilizes more dynamic shading. Both styles serve their stories perfectly, but the shift can be disorienting if watching them back-to-back without a break.

Addressing the “Which Is Better?” Debate

It is reductive to label one inferior. Fullmetal Alchemist (2003) is an original speculative fiction story that used a manga foundation to build a meditation on grief and war. It takes risks that a direct adaptation never could. Fullmetal Alchemist: Brotherhood is one of animation’s greatest direct adaptations, a complete and masterfully woven epic where every Chekhov’s gun fires perfectly. If you have time for only one, Brotherhood delivers the intended message. If you desire a deep, artistic exploration of “what if,” the 2003 series is mandatory viewing. Many dedicated fans say you haven’t truly experienced Fullmetal Alchemist until you’ve cried through both.

Final Recommendation: Starting Your Alchemic Journey

For an absolute beginner, watching Fullmetal Alchemist: Brotherhood (available on Netflix in select regions) offers the least friction and the highest payoff. Its pacing picks up quickly, and its ending is universally satisfying. Once you finish, let the experience sit with you. Then, approach the 2003 series not as a duplicate, but as a fascinating alternate-history novel. Listen to its darker music, follow its tragic homunculi, and watch its movie. You will gain a deeper appreciation for Hiromu Arakawa’s world by seeing how malleable its laws can be. Whichever path you choose, you are stepping into a world where humanity, for all its flaws, holds the ultimate answer to the mysteries of the universe.