The Eternal Doctor and Oliver return to Earth in 2021 after what was supposed to be a peaceful retreat on Elysia Prime—a paradise world of floating waterfalls and endless tranquillity. However, upon returning to Earth, their plans for actual rest are cut short when Sophie Evans, Oliver’s journalist girlfriend, pulls them into a growing mystery.

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The Threxil, an alien race that arrived just days earlier, have been welcomed as peaceful refugees, offering miraculous technology and medical breakthroughs. While the public and global governments have embraced them, Sophie remains skeptical, noticing troubling patterns of disappearances near Threxil settlements. Determined to uncover the truth, she enlists the Doctor’s help—despite Oliver’s reluctance to assume the worst.

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Attending a public address by Zerax, the Threxil’s charismatic ambassador, the Doctor is met with charm and deflection. Though Zerax effortlessly evades their pointed questions, the Doctor picks up on subtle inconsistencies in his carefully crafted narrative. Meanwhile, Sophie uncovers encrypted files hidden within the Threxil’s database, revealing a sinister truth: the Threxil are abducting humans as test subjects for a secret terraforming project. The Doctor’s investigation confirms their worst fears—the Threxil’s refugee story is a lie. Earth is not their sanctuary; it is their next conquest.

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With the truth in hand, the group rushes to expose the Threxil before their plans come to fruition. But the Threxil move swiftly, using mind-control technology to silence dissent and turn public opinion against the Doctor and Sophie. As the aliens tighten their grip, the Doctor formulates a daring plan to disrupt their terraforming devices, buying time to rally humanity against the invasion. In a desperate showdown, the Doctor, Oliver, and Sophie sabotage the Threxil’s technology, forcing them to retreat—though not without a warning that they will return.

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With the immediate threat averted, Sophie faces the consequences of her investigation. The government scrambles to cover up the truth, leaving her career in jeopardy. Yet, her resolve remains unshaken. Recognizing her courage and keen instincts, the Doctor offers her a place aboard the TARDIS. After a moment of hesitation, Sophie steps inside, wonder in her eyes as the ship dematerializes—taking the trio toward their next adventure.

The TARDIS landed on a barren, ash-gray world under a dim twilight sky—no sun, no stars, just a smothering half-light that felt wrong in every direction. The surface was cracked and dry, like a planet long abandoned by time itself. I hadn’t even finished scanning the atmosphere before the ground collapsed beneath us, dropping Sophie, Oliver, and me into a vast underground cave system. We were shaken but intact. The silence down there wasn’t natural—it pressed in from all sides, interrupted only by faint whispers with no clear source. When Sophie’s torch caught claw marks gouged deep into the walls, I knew exactly what we were dealing with. I didn’t explain. Not fully. Some things are worse when you understand them.

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The Quiet Ones. I’d encountered them before, or something close. Creatures born of silence, twisted by some calamity into things that should not be. Pale, hollow-eyed figures, their faces stretched into permanent screams, soundless but screaming all the same. When one of them emerged from the dark, we ran. There was no reasoning, no fighting—not in any way that would last. They hunted with a kind of intelligence I’ve only seen in the most dangerous predators: coordinated, methodical, always just behind us. The deeper we went, the worse it got. I recognized the architecture of their madness—the signs of a civilization that once lived here, buried now under layers of fear, rage, and ruin. They weren’t ghosts. They weren’t mindless. They remembered.

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We found the TARDIS buried in rubble, half-submerged in stone, surrounded by whispers and shadows that crawled just beyond the torchlight. I cobbled together a crude light-burst emitter to keep the Quiet Ones at bay while Oliver and Sophie cleared the doors. Every second was too long. Just before the creatures could reach us, we made it inside, their claws raking against the blue doors as I threw the lever. The TARDIS took us away, but the silence they brought lingered long after we’d left. I didn’t say much after that. There are places the TARDIS should never land. That world—whatever year, whatever name it once had—was one of them.​

After narrowly escaping the horrors of the Quiet Ones on a desolate world of dead skies and labyrinthine caves, where the Doctor, Oliver, and Sophie were hunted by the mutated remnants of a lost civilization, the Doctor took them to 2025 for respite—a familiar time for Oliver and Sophie, meant to offer peace after trauma—but soon detected a small Dimensional Tear forming in the side of a nearby building.

As the tear grew, the Doctor discovered it was being manipulated by the Kaldar, interdimensional beings capable of phasing between realities and subtly warping the behavior of nearby humans to destabilize the timeline. As the rift expanded and the Kaldar’s presence deepened, a second tear opened, through which the Tenth Doctor arrived, drawn by the same temporal instability, and the two Doctors worked together to identify the Kaldar’s plan to collapse the 2025 timeline and use Earth as a staging ground for multiversal invasion.

With time bleeding and more Kaldar emerging, the Doctors triggered a collapse of the rift's energy structure, forcing the invaders back into their own dimension, though one warned this was only the beginning. After the Tenth Doctor departed, the Doctor returned to the TARDIS with Oliver and Sophie, deeply unsettled by the scale of what had just been prevented.