The first trailer for Frozen Fever, the short movie sequel to the Disney blockbuster, has been released.
The seven-minute film, which will be screened ahead of Disney's Cinderella in cinemas in March, sees original cast members Idina Menzel (Elsa), Kristen Bell (Anna), Jonathan Groff (Kristoff) and Josh Gad (Olaf) reprising their roles.
There will also be a new song by the Oscar-winning husband-and-wife team of Robert Lopez and Kristen Anderson-Lopez.
The first revisiting of the characters features some surprising changes, including older sister Queen Elsa's attitude.
Elsa, weighed down by her royal duties in Frozen, has lightened up so much that she's throwing Princess Anna a birthday party.
Co-director Chris Buck said: "It's another side of Elsa the audience hasn't seen before and we hadn't really played with in the original feature."
The birthday plans go awry when the powerfully magic Elsa comes down with a cold on the big day.
Co-director Jennifer Lee told USA Today. "Elsa doesn't get a cold in the usual way.
"She's special. Surprising things occur that wreak a little havoc."
Josh Gad, who voices Olaf, added: "The gang is back together. And literally it's like we never went away.
"Every day we're reminded of Frozen in our lives. So it feels like a continuation of a saga that has many parts still untold. It felt like coming home again after a short absence."
Frozen, inspired by Hans Christian Andersen's The Snow Queen, became a global phenomenon after its release in 2013, winning two Oscars (one a Best Original Song award for critically acclaimed hit Let It Go) and earning more than $1.27 billion globally. It is the fifth highest grossing film of all time.
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