Spoilers: Lifeline, Doppelganger
Disclaimer: Do people get as tired of reading these as I do of writing them? Nicht meine.
A/N: Intended as a John&Elizabeth friendship piece rather than Sparky (despite a part I know looks highly suspicious), but can be construed as such if you’re so inclined. How disturbing parts of this story are probably depends on how vivid your imagination is; in my head it is rather gory because I figured that’s what John would see.
This story diverges from the episode Doppelganger after Rodney’s ‘death’ at the point John realises he’s in a nightmare and attacks the crystal entity that looks like him, throwing them both through the wall.