Fics like The Detour Equivalency

Some Universes are darker than others. In some Universes Mary Cooper is the one to die and George Cooper is the one to live. Sheldon has to put his life on hold and Penny is there when he can finally start living again.

You may also like

Between Life and Being Alive by withabigbang (The Big Bang Theory (TV))
Quantum Hearts by Margarita333 (The Big Bang Theory (TV), Young Sheldon (TV))
The Uncertainty Principle by Ms_Informed (Charmed (TV), The Big Bang Theory (TV))
Like Magic by DraconisHyperion (The Big Bang Theory (TV), Harry Potter - J. K. Rowling)
Penny's Code of Conduct For Sheldon Cooper by WittyWallflower (The Big Bang Theory (TV))
The Magic of What Could Have Been (or, Blink, and You Might Miss It) by bixgirl1 (The Big Bang Theory (TV))
Top Harry Drabbles by sunshinedrift (Harry Potter - J. K. Rowling, Twilight Series - All Media Types, more)
Ain't Mean a Thang by Nukas (The Big Bang Theory (TV), Young Sheldon)
The Omaha Suck & Swallow by Down_Badguy (The Big Bang Theory (TV))
The Progressions of a Life by Opy3332 (The Big Bang Theory (TV))
The Sliding Corollary by Daedaleopsis (The Big Bang Theory (TV), Sliders)
The Time Travel Issue by brinadevries (Young Sheldon (TV), The Big Bang Theory (TV))
The Superior Physicist Theorem by NicWin (The Big Bang Theory (TV))
2 Prodigies by MARVELFAN20 (Young Sheldon (TV), The Big Bang Theory (TV))
Ooh, the things I've known, looks like I'm taking the hard way home by SilverShadow1 (Young Sheldon (TV), The Big Bang Theory (TV))
It Started as a Dare (But Nobody’s Laughing Now) by sinusiridum (The Big Bang Theory (TV))
We Could Be Theoretically Physical by TheMistahWolf (The Big Bang Theory (TV))
'Cause he's stronger than you know, a heart of steel starts to grow by SilverShadow1 (The Big Bang Theory (TV), Young Sheldon (TV))
cabin fever dream by LaurenThemself (The Big Bang Theory (TV), Newsflesh Trilogy - Mira Grant)
The Emergency Plan Addendum by Daedaleopsis (B - Fandom, The Big Bang Theory (TV))