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The episode was first announced on Sweden's Nickelodeon (and will air in Denmark and Norway that same day), but will air in Australia in September and the U.S. in October. More to come in the coming weeks.
Title: School Raze, Parts 1 & 2
Air Dates:
Nickelodeon (Sweden, Denmark, Norway):
August 28 (6:25pm EST, Part 1)
August 29 (6:25pm EST, Part 2)
Boomerang (Australia):
September 7 (6:30pm EST, Part 1)
September 8 (6:30pm EST, Part 2)
Disc. Family (U.S.): October 13.
Part 1: 11am EST
Part 2: 11:30am EST
Writers:
Part 1: Nicole Dubuc
Part 2: Josh Haber
Synopsis:
Part 1: When the magic of Equestria mysteriously begins to fail, Twilight leads her friends on a quest for answers, leaving the School of Friendship open to attack from a dangerous mastermind.
Part 2: While Twilight and the rest of the Mane Six try to escape Tartarus, Cozy Glow furthers her plot to take over the School of Friendship with only Twilight's students and the CMC's to stop her!
Extra Note: This is the Season 8 finale!
A user on EQD, Kuco, is planning to stream the event.
Also, from @Jeric:
Video links (SendVid):
Part 1:
Part 2: