It's been 8 years since Super Metroid was released. A console generation has been skipped for the Metroid series. Retro Studios, under the pressure of disdain and lack of faith from fans of the series, is putting their blood, sweat, and tears into reaching the imminent deadline for the release of Metroid Prime. Most importantly, Retro Studios & Nintendo R&D1 were redefining what makes a Metroid game with Metroid Prime and the game that I am talking about, Metroid Fusion.
Metroid Fusion is the series at its most thematically rich, if not among the richest in Nintendo's 40+ year lineup. Where Super Metroid was a game about respecting the player through its nonlinear level design and wordless storytelling as a representation of Samus's agency, Fusion forces dialogue and hand holding down your throat as you walk through these cold, linear hallways. Where Samus went to Zebes on her own accord, Samus is being ordered around the BSL. Where you could easily tank a couple of hits in Super Metroid, normal enemies are now a threat and deal a whole lot more damage to Samus, deeming this as Samus at her most vulnerable. That's not to say that Fusion is worse with these deliberate choices, just different. It is rather a compliment to Super Metroid. It is a foil mainly due to how Samus's agency is treated in both games.
Despite the game barraging you with dialogue more than any 2D Metroid before, this game flows with such a breakneck pace; you are always fighting bosses, collecting upgrades, discovering new enemies, opening up new areas, yet the game never dwells on any moment for too long. Everything here has been deliberately streamlined. Levels are now man-made rather than alien. Enemies hit much harder. Bosses are some of the deadliest in the entire series. Missiles are no longer toggled, they’re done through holding a button and comboing that with another. Super missiles stack into missiles, and using power bombs is much easier, done by holding the R button + B. The only thing that holds this game back is how it loves to show no cues for solutions. Outside of MercurySteam's Metroid games, the series always had its fair share of cryptic answers, but Fusion has it the worst here when there are a couple of them in the critical path, but even then, in some aspects like the green rooms of the maps, the areas the map doesn’t want to show you, I could say that it is a case of Samus regaining her agency, by uncovering what the game doesn’t want you to see. This constant loop of finding hidden areas isn’t commended enough and Fusion’s execution of this theme beats Portal’s execution of such by a landslide.
Destruction. Destruction! DESTRUCTION! That is all that is running through whatever cerebral cortex the SA-X has. The SA-X is a manifestation of Samus's consequences for nearly exterminating the entire Metroid species on SR388, both metaphorically and literally; how the X are able to roam free on the planet since all of the Metroids are gone and the X parasites were combated by them. It has every single beam & missile upgrade from your Power Suit. With Samus now having Metroid DNA and being at her most vulnerable state yet, she now knows how it feels to become the hunted, especially being hunted by herself for she is now the Metroid. While not as fun to run away from as the E.M.M.I's in Metroid Dread, this foil is what makes the SA-X my favorite villain in the series. You are no longer who you once were, you are who you are right now, and now, it is time to kill the past.

Not all of Samus’s experiences on SR388 were just killing; the most pivotal point in the series is in Metroid II: The Return of Samus where there is but one Metroid. Instead of killing it like she did the rest, she takes the baby Metroid to her ship for what we now know is a sign of empathy. Her human parents were killed by space pirates at a young age so when you are the only family left, there will be no more once you face death. Her empathy doesn’t stop there. In Super Metroid, the canonical ending is one where she saves Etecoons and the Dachoras from an exploding Zebes, creatures that were the only harmless aliens that she has encountered on Zebes for they taught her abilities such as the wall jump and the Shinespark. Karma is a theme in Fusion. Her near extinction of the Metroid species is what made the X parasite infect her and made her biggest threat yet, but her empathy is what saves her in the end.

The story of Metroid Fusion was always my favorite in the series, but replaying it after the somewhat bad taste Prime left in my mouth made me appreciate it more. It is one of the most thematically rich games that I have ever played, one of my top 3 games in the series, and although highly rated among user review sites, the game deserves a lot more love than it currently has.