Sneak peek: 'Frozen' returns in 'Frozen Fever' 

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Sneak peek: \'Frozen\' returns in \'Frozen Fever\'

Exclusive sneak peek: The \'Frozen\' gang returns with the short \'Frozen Fever,\' which will play in front of Disney\'s live-action \'Cinderella.\'

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Sneak peek: 'Frozen' returns in 'Frozen Fever'

Bryan Alexander, USA TODAY 2:14 p.m. EST February 2, 2015

Anna wakes up to a very special birthday party hosted by big sister Elsa in 'Frozen Fever.'

The filmmakers who brought us the animated hit musical Frozen in November 2013 have created a seven-minute short centered around Princess Anna (voiced by Kristen Bell), Princess Elsa (Idina Menzel), Kristoff (Jonathan Groff) and the snowman Olaf (Josh Gad).

Frozen Fever will show in theaters before Disney\'s live-action Cinderella, out March 13.

"The gang is back together. And literally it\'s like we never went away," says Gad. "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."

The new Disney short "Frozen Fever" brings back sisters Anna, left, and Elsa in a new adventure that will be released March 13, showing in theaters in front of "Cinderella." 

In "Frozen," it was Anna trying to wake up her sister Elsa to build a snowman. "Now it\'s Elsa\'s turn to wake Anna up," says director Chris Buck. 

It\'s Anna\'s birthday and sister Elsa is determined to give her the best celebration ever. "They never celebrated a birthday together. Elsa feels it\'s (a chance to do) something nice for her sister," says director Chris Buck. 

Josh Gad says of his snowman Olaf: "From the beginning, the key to finding that character was naivete, innocence and youthfulness." 

"Frozen Fever" offers an unusual family portrait, including Sven the reindeer, Olaf the snowman, Kristoff and two princesses. 

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The first revisiting of the now-beloved characters features some surprising changes, including older sister Elsa\'s attitude. Elsa, weighed down by her royal duties in

Frozen, has lightened up so much that she\'s throwing Anna a birthday bash.

"It\'s another side of Elsa the audience hasn\'t seen before and we hadn\'t really played with in the original feature," says Chris Buck, who reunited with Jennifer Lee to direct the short.

The birthday plans go awry when the powerfully magic Elsa comes down with a cold on the big day.

"Elsa doesn\'t get a cold in the usual way," says Lee. "She\'s special. Surprising things occur that wreak a little havoc."

It's Anna's birthday and Elsa and Kristoff are determined to give her the best celebration ever in 'Frozen Fever.'

The short features a new song from the husband-and-wife team of Robert Lopez and Kristen Anderson-Lopez, who won an Oscar for

"If history is any indicator, kids will go nuts," says Gad.

Life for the two princesses has changed in other ways. Olaf and Kristoff (along with Sven, the non-verbal reindeer) add to a highly unorthodox family. Their goofy portrait, inspired by the website AwkwardFamilyPhotos.com, hangs in the castle.

"There\'s a slight dorkiness to the painting," says Lee. "But it\'s the best thing they could all wish for, just that ordinary family feeling."

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Frozen landscape is also changed, as the kingdom embraces warm weather and Anna\'s summer solstice birthday. The directors promise other surprises as well. But the sister\'s rock-solid support for each other doesn\'t change from Frozen, which took in more than $400 million at the box office.

"We continue this story of these two sisters, who only had each other growing up together," says Gad. "They are still supporting each other. That\'s what this is about."

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