The Parasite Eve franchise stands as one of the most distinctive cinematic horror RPG sagas in gaming history. Conceived during Square's golden era on the original PlayStation, the series merged sci-fi bio-horror with tactical role-playing mechanics. Central to the overarching narrative is the concept of evolutionary biology—specifically, the idea that mitochondria, the energy-producing organelles inside human cells, possess a collective consciousness striving to overthrow host organisms and spawn the ultimate biological entity.
Spanning a foundational novel, two iconic PlayStation titles, and a PSP spin-off tactical shooter, the story follows NYPD officer turned special agent Aya Brea across multiple decades. Understanding the grand scope of this cellular warfare requires looking at the events in strict chronological order.
1995: The Maruyama Incident (Novel Prequel Background)
Before the events depicted in video games, the origin of the cellular awakening occurred in Tokyo, Japan. A scientist named Toshiaki Nagashima lost his wife, Kiyomi, in a tragic car accident. Devastated, Toshiaki sought to preserve her memory by harvesting tissue samples from her body. Unbeknownst to him, Kiyomi's mitochondria had already gained sentient awareness and evolved into the original designated target known as Eve.
Eve manipulated Toshiaki into cultivating her cells within a kidney transplant recipient, Eve Maruyama. Once awakened, Eve attempted to gestate an Ultimate Being using human biomass. Although Japanese medical authorities and researchers successfully thwarted Eve's plans before total disaster struck, the biological precedent was established: mitochondria across the globe could mutate, communicate, and initiate spontaneous human combustion.
December 1997: The Manhattan Blockade (Parasite Eve)
The timeline shifts to New York City during Christmas Eve of 1997. NYPD rookie officer Aya Brea attends an opera performance at Carnegie Hall. During the show, lead actress Melissa Pearce undergoes a horrific biological transformation triggered by her dormant mutated mitochondria. The audience around her spontaneously combusts, leaving Aya as the sole survivor unharmed due to her unique cellular constitution.
Over the next six days, New York City descends into chaos:
- Day 1–2: Melissa accepts her role as the new Eve, causing mutated animal outbreaks across Carnegie Hall and Central Park. Aya discovers that her twin sister, Maya, died in an automobile accident years prior, and Maya's organ donor tissue was split between Aya (cornea) and Melissa (kidney). This shared cellular connection grants Aya special powers while rendering her immune to Eve's combustion aura.
- Day 3–4: Manhattan is entirely evacuated by the military. Scientist Dr. Hans Klamp assists Eve behind the scenes, attempting to craft a sperm cell capable of fertilizing Eve's mutated egg to conceive the Ultimate Being. NYPD detective Daniel Dollis and scientist Kunihiko Maeda assist Aya in uncovering the biological mechanisms at play.
- Day 5–6: Eve retreats to Liberty Island, where she successfully gives birth to the Ultimate Being. Aya engages the rapidly mutating creature on a U.S. Navy battleship, destroying its physical vessel and incinerating its cellular code using superheated engine exhaust.
September 2000: The Neo-Ark and ANK Outbreak (Parasite Eve II)
Three years after the Manhattan Blockade, Aya Brea has relocated to Los Angeles and joined M.I.T.O. (Mitochondrion Investigation and Suppression Team), a specialized task force created by the FBI to hunt down remaining Artificial Neo-Mitochondrial Creatures (A.N.K.s).
The central events of Parasite Eve II unfold across several key locations:
- The Akropolis Tower: M.I.T.O. responds to a biological attack in a Los Angeles skyscraper. Aya discovers that rogue government factions have begun synthesizing human DNA with Neo-Mitochondrial cells to create biological weapons.
- Dryfield, Nevada: Investigating the source of these illegal mutations leads Aya to a small desert town. She meets mercenary Kyle Madigan and learns of a secret underground military laboratory hidden beneath the desert known as Neo-Ark.
- The Neo-Ark Facility: Aya discovers an artificial biosphere where genetically engineered creatures are cultivated. Deep within the facility, she uncovers Eve Brea—a young clone created from Aya's own genetic material to act as a master controller for the A.N.K. organism.
Aya destroys the artificial supreme creature generated by the corrupt militarized program, rescues young Eve, and formally adopts her as a sister with help from fellow agent Rupert Broderick.
December 2012 – 2013: The Overdive Crisis (The 3rd Birthday)
A decade after the Neo-Ark incident, a catastrophic biological event strikes New York City. Horrifying giant subterranean roots burst through the ground, accompanied by terrifying biological monsters called the "Twisted." Humanity forms the Counter Twisted Investigation (CTI) team to combat the threat.
The narrative structure of The 3rd Birthday relies heavily on time manipulation and shifting perspectives:
- The Overdive System: CTI scientists discover that Aya possesses the unique ability to project her consciousness backward through time into the bodies of past soldiers. By changing actions in previous timeline events, CTI attempts to prevent the timeline where the Twisted destroy civilization.
- The Wedding Day Tragedy (December 24, 2010): It is ultimately revealed that during Aya's wedding to Kyle Madigan in 2010, SWAT troops raided the church. In the panic, Aya was fatally shot. To save her sister, young Eve Brea attempted to transfer her consciousness into Aya's body, triggering a timeline shatter.
- The Truth of the High-Ones: The real Aya Brea's soul was torn into fragments, creating the Twisted creatures. Meanwhile, the entity players control throughout the game is actually Eve Brea inhabiting Aya's body, suffering from severe amnesia.
- The Final Sacrifice: Realizing that her presence in Aya's body causes the catastrophic loop, Eve forces her friend Hyde Bohr and surviving allies to shoot Aya's body before the rift expands, erasing the Twisted timeline and restoring reality at the cost of Aya's original life.
Chronological Overview Table
| Year | In-Universe Event | Media Title |
|---|---|---|
| 1995 | The Maruyama Mitochondria Awakening | Parasite Eve (Novel) |
| 1997 | The Manhattan Blockade & Carnegie Hall Outbreak | Parasite Eve |
| 2000 | The Akropolis Incident & Neo-Ark Facility Raid | Parasite Eve II |
| 2010 | The SWAT Raid on Aya and Kyle's Wedding | The 3rd Birthday (Backstory) |
| 2012–2013 | The Overdive Counter-Invasion of New York | The 3rd Birthday |
Frequently Asked Questions
Is the original Parasite Eve novel canon to the video games?
Yes. The events of Hideaki Sena's 1995 novel serve as the direct biological backstory for the game universe. Characters in the original Parasite Eve game frequently refer to the medical reports and research stemming from the 1995 Tokyo incident.
Why is The 3rd Birthday not called Parasite Eve III?
Due to licensing agreements involving the original novel's copyright holder, Square Enix opted to title the PSP release The 3rd Birthday. While it serves as a continuation of Aya Brea's arc, it reframes the series from survival horror RPG to a third-person tactical action shooter with time-travel mechanics.
What order should I play the games in?
For the best narrative experience, play the titles in release order:
- Parasite Eve (1998)
- Parasite Eve II (1999)
- The 3rd Birthday (2010)
Final Thoughts
The Parasite Eve timeline is one of gaming's most fascinating sci-fi narratives. From grounded cellular science in late-90s New York to time-bending apocalypse scenarios in 2013, Aya Brea's struggle against rebellious organelles remains a standout story in Square Enix's historic catalog.
