Key events in science fiction sagas

The Eros Incident is a catastrophic turning point in *The Expanse*, revealing the terrifying power of the Protomolecule and escalating tensions between Earth and Mars. It fundamentally reshapes the political landscape and introduces the central mystery of the alien technology.

This event is crucial as it marked a devastating blow to the Galactic Republic and the Jedi Order, forcing the Republic to sign a humiliating treaty. It showcased the Sith Empire's power and set a precedent for future galactic conflicts.

The Battle of Yavin is a cornerstone of the Star Wars saga, representing the Rebel Alliance's first major victory against the Galactic Empire. Luke Skywalker's destruction of the Death Star provided a beacon of hope and established the timeline's reference point.

This shocking opening sequence immediately establishes the high stakes of *Mass Effect 2*, demonstrating the fragility of the protagonist and the galaxy's precarious state. It sets the stage for Shepard's resurrection and the overarching Collector threat.

This event is the long-awaited and terrifying culmination of the Reaper threat, instantly establishing the dire stakes of *Mass Effect 3*. It plunges humanity into a desperate war for survival, making it a defining moment for the saga.

This event fundamentally alters the scope of *The Expanse* universe, transforming it from a solar system conflict to an interstellar one. It ushers in a new era of exploration, colonization, and unprecedented conflict over new worlds.

The Horus Heresy is the defining civil war of the Warhammer 40,000 universe, fundamentally shaping its grimdark future. It represents the ultimate betrayal and the fall of humanity's greatest champions, leading to the Emperor's internment and the Imperium's enduring struggle.

The Fall of Cadia is a recent and immensely impactful event, signifying a major defeat for the Imperium and the tearing of the galaxy by the Great Rift. It marks a new, even darker chapter for the Warhammer 40,000 universe.

This event is the foundational premise of the entire *Foundation* saga, as Hari Seldon's prediction of the Galactic Empire's collapse sets in motion all subsequent events. It introduces the core concept of psychohistory and the attempt to guide humanity's future.

This event is the genesis of the Star Trek universe, marking humanity's first successful warp flight and subsequent first contact with the Vulcans. It sets humanity on a path of interstellar exploration and cooperation, leading to the formation of the Federation.

The Butlerian Jihad is a foundational event in the Dune saga, establishing the universe's strict taboo against 'thinking machines.' This rebellion against AI profoundly shapes human society, technology, and the development of mental disciplines like the Bene Gesserit.

This event is the inciting incident for the entire *Dune* narrative, setting in motion the tragic downfall of House Atreides and Paul's rise. It directly leads to the central conflict and the unfolding of the saga's prophecies.