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The Reformed Four made a trip to the past; This time to help the Mane Six to defeat the Changelings in Canterlot.
safe1588406 artist:3d4d993 edit119453 edited screencap57129 screencap203589 applejack160106 crystal hoof113 discord28946 fluttershy199533 pinkie pie204701 rainbow dash220850 rarity170943 starlight glimmer44338 thorax4014 trixie62732 twilight sparkle284668 changeling40817 pony855704 unicorn271107 a canterlot wedding2415 alternate universe9493 disguise4027 disguised changeling2300 female919059 mane six29666 mare420872 reformed four150


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7 comments posted
My Little Pony - 1992 Edition
Wallet After Summer Sale -

It seems the nature of time in the mlp world is paradox-proof in nature. My guess is how it does this is in the event that something happens that changes the timeline, even in a paradoxical way, instead of collapsing it partially disconnects whatever is responsible from the flow of causality, by making it so they can effect the timeline, but the timeline can’t effect them, so that way no paradoxes resulting from altering your can happen. Ex: you couldn’t cause a paradox by going back in time and killing you grandfather as you would be disconnected from the effects of the alteration you just made, basically making you an effect with no cause.
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Background Pony #0C8A
Hopefully Future Thorax does not meet his past self in this point in time.
Background Pony #0FB1
Reminds me of Doctor Who's time travel rules, only less restrictive in that regard (You're allowed to reshape the world without it breaking the timeline as long as its not a fixed point).

@Background Pony #A9A0
You're not wrong. MLP covers the implications of time travel very firmly in that you are either:

A: Making a stable time loop and changing nothing.

B: Causing a butterfly affect that reshapes the world.

There is no middle ground.

And doing the above situation would break everything. Seeing Discord as a friend would make Fluttershy less likely to put her hoof down in regards to Discord's early betrayal antics. Seeing Starlight being a friend would make them more likely to trust her outright when they encounter her, resulting in a much more comprehensive loss for the Mane 6 when they encounter past Starlight.
Background Pony #45E5
As much as I love the concept of time travel, and I haven't gotten tired of seeing it in fiction yet, I think whenever ponies mess around with time in MLP, it always ends badly.
Background Pony #C026
Fighting his kin once again must be severely uncomfortable for Thorax. Who knows, he might even have to fight himself this time.