Fanfic: Substitute Harmony
"Substitute Harmony" is a multi-chapter fanfic of My Little Pony: Friendship Is Magic
by Blayze Kohime.
Plot synopsis: A strange group of ponies (who just happen to be main characters from the original G1 My Little Pony series) attempt to kidnap the Mane 6 with the apparent intent of stealing the Elements of Harmony. Pinkie Pie is the only one that escapes, and is briefly blamed for the commotion due to a misunderstanding.
Her sisters, Blinkie and Inkie, arrive to help, wrecking Ponyville town square in the process. The events also bring Trixie and Gilda to the town, for various reasons. Oh, and Ditzy's here; she's brought you a letter. When the circumstances end up pushing them all into a group, they are forced to work together to find out where the strange other-worldly ponies have come from and what dark force is leading them.
Read it here
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