Emily Blunt breaks bad as villainous unicorn in exclusive new 'My Little Pony' trailer

Brian Truitt | USA TODAY

Show Caption Hide Caption Exclusive: Emily Blunt voices one bad unicorn in 'My Little Pony' trailer Tempest Shadow (voiced by Emily Blunt) wants to steal some serious pony magic in the animated film 'My Little Pony: The Movie.'

There's no sugar or spice, just everything not very nice about Tempest Shadow.

Before she goes all supercalifragilisticexpialidocious next year in Mary Poppins Returns, Emily Blunt is breaking bad as the voice of the unicorn villainess in the animated My Little Pony: The Movie (in theaters Oct. 6).

Brandishing a broken horn and no patience for parties or pink-painted nails, Tempest threatens Princess Twilight Sparkle (Tara Strong) and the other good ponies of Equestria in the new trailer exclusively premiering at usatoday.com.

A second-in-command to the evil Storm King (Liev Schreiber), Commander Tempest aims to steal the ponies' magic but our heroes find a wide variety of allies, including parrot pirate Captain Celaeno (Zoe Saldana) and her crew. (Also, dig that spunky, pony-themed version of We Got the Beat.)

Blunt's not the only celebrity guest star in the Pony project: Female fans and Bronies alike can also expect Kristin Chenoweth as royal seapony Princess Skystar, Uzo Aduba as Skystar's mom Queen Novo, Michael Peña as Tempest's hedgehog No. 2 Grubber, Taye Diggs as feline con artist Capper and pop star Sia as the very Sia-looking Songbird Serenade.