Guys, i got a game theory.
# [Theory] ULTRAKILL and Undertale Share a Unified Post-Apocalyptic Timeline (And It's a Masterpiece of Sci-Fi Tragedy)
Hear me out. If you step away from the visual aesthetics and look strictly at the official dates, theological mythos, and core rules of both universes, **Undertale is the secret post-apocalyptic epilogue to ULTRAKILL.**
Instead of being completely separate entities, the Underground serves as humanity's final, desperate sanctuary, and the monsters are a divine "Second Draft" hidden away from a dying world.
Here is the breakdown of this bulletproof, fully integrated timeline.
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### Act I: The Golden Age of Innovation (201X)
* **The Dawn of AI:** As shown in *Undertale’s* opening cinematic, Chara falls into the Underground in **201X**. On the surface, this matches the dawn of humanity's high-tech robotic revolution. This is the era when humanity is experimenting with advanced artificial intelligence, leading to the creation of **SmileOS 2.0** and early utility/entertainment prototypes (the original Mettaton chassis).
* **The First Seal:** Following the tragic deaths of Chara and Asriel, King Asgore declares war on humanity. The magical Barrier is sealed tightly, leaving the monsters completely isolated in the dark while the human surface world continues its trajectory toward extreme militarization.
### Act II: The "War Without Reason" & The Gaster Project (Late 2100s)
* **The Surface Apocalypse:** Fast forward a century. The surface world completely collapses into the **War Without Reason** (matching *ULTRAKILL's* canon timeline). Humanity begins mass-producing automated slaughter engines like Guttermen, Guttertanks, and the skyscraper-sized Earthmovers, poisoning the atmosphere.
* **The Desperate Asylum & The CORE:** Realizing the surface is entirely doomed, the final generation of human leaders remember the old medieval legends of Mt. Ebott. They breach the barrier from the outside, begging the monsters for forgiveness and asylum. The monsters choose mercy. Together with the Royal Scientist, **W.D. Gaster**, human cybernetic engineers begin constructing the **CORE**.
* *The Lore Twist:* The CORE wasn't just a power grid. It was humanity's final, desperate project to create a **universal, infinite blood substitute** to permanently shut down the blood-fueled war machines roaming the surface. During this era of temporary peace, a broken human entertainment prototype running SmileOS 2.0 is brought down to help with infrastructure—the robot body Alphys would later find.
* **The Tragedy of Errors:** Disaster strikes when Gaster suffers his catastrophic accident, shattering across time and space. The monsters, unfamiliar with volatile human military mechanics, panic and blame the humans for sabotaging their greatest mind. They banish the human refugees back to the surface and **seal the Barrier shut for the second time**, completely unaware that they just locked humanity out right as the hyper-lethal, blood-fueled V-series units were being deployed.
### Act III: God’s Despair and the "Second Draft"
This connects the deep, existential theology of *ULTRAKILL* (where God is a depressed creator who wept over His mistakes) directly to *Undertale*:
* **Divine Therapy:** After witnessing the sheer cruelty of humanity (The First Draft) and the autonomous malice of a sentient Hell, God suffered a severe psychological collapse. To ease His mind and prove He could make something gentle, He created the Monsters.
* **The Rules of Magic:** He stripped away physical meat, blood, and volatile human souls. Instead, He made them out of pure **Magic** and emotional resonance, placing them deep within Mt. Ebott where *"there was nothing punishing and growing by death beneath their feet"* (safely insulated from Hell's sado-masochistic consciousness).
* **The Disappearance:** When God saw that His violent First Draft (Humans) had tracked down and locked up His peaceful Second Draft (Monsters) behind a barrier, His depression turned to absolute despair. He abandoned Heaven and vanished into the void, leaving the universe to run on cold automation.
### Act IV: Mankind is Dead. Blood is Fuel. (Modern Day / 2200s+)
* **The Last Oasis:** On the surface, the war reaches its absolute mathematical conclusion. Without the CORE’s energy broadcast, the starving machines wipe out every human on Earth, eventually descending into Hell.
* **The Trauma of Frisk:** Frisk is a lone human child descended from the absolute final pocket of humans surviving in the surface ruins, fleeing the robotic wasteland. They fall into Mt. Ebott, suffering a massive concussion that wipes out their memories of the metallic nightmare above. The whimsical world of *Undertale* begins as a psychological coping mechanism—Frisk's brain literally overlays a cute, 8-bit fantasy over what is actually a dark, subterranean cave system to keep from completely losing their mind.
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### Why the Mechanics & Lore Completely Align:
**Undyne’s Determination vs. Prime Souls:** In *Undertale*, Undyne the Undying completely defies monster biology by refusing to turn to dust, manifesting a new physical body out of raw willpower before melting away. This is the exact same cosmic mechanism that births **Minos Prime and Sisyphus Prime** in *ULTRAKILL*—souls so loaded with sheer, unadulterated conviction and willpower that they refuse to dissolve into the ether, creating an unstable physical form out of pure energy.
**Mettaton’s True Code:** Mettaton looks completely different from any machine in either game because he is a hybrid. He is a surface military-grade prototype running on **SmileOS 2.0** (which hardcodes his obsession with ratings, drama, and theater) but heavily refurbished by Alphys, who stripped his heavy tactical armor for pink cosmetic plating and disco balls to make him "cute." In the Genocide Route, his code tries to force a "human eradication protocol" (Mettaton NEO), but because Alphys swapped his armor for decorative plastic, he gets famously deleted in a single hit.
**The Medieval Culture Clash:** The monsters live with a medieval mindset of honor, combat turns, and dialogue. They have no concept of 22nd-century autonomous war. If **V1** ever breached the Barrier tracking Frisk's blood signal, it wouldn't play by the rules. It has no soul for monsters to attack, and it doesn't wait for a "turn." It moves at supersonic speeds, coin-flipping its way through the Underground.
* Imagine the sheer tragedy of Undyne, broken and bleeding magical dust, clutching V1’s cold, titanium arm and coughing: *"Is... is this all you can do, you silent bastard? Show me what you've got!"*—only to be met with the cold, unfeeling click of a revolver hammer.
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**TL;DR:** Undertale’s Underground is a hidden pocket of Earth where a depressed, absent God hid His peaceful "Second Draft" of creation. The monsters locked the doors to protect themselves, accidentally causing the extinction of the human race outside to the machines. Decades later, Frisk falls in to escape the metal wasteland, completely oblivious to the fact that the most lethal war machine ever built (V1) is currently drilling its way down to harvest the very last drop of human blood.
Change my mind.