Julie Andrews To Play Helpful Sea Monster In New 'Aquaman'

The hills are alive with the sound of the best casting decision Hollywood has ever made.

The legendary Sound Of Music actress will be voicing a character in the long-awaited Aquaman film that also stars Jason Momoa, Amber Heard, Willem Dafoe and Nicole Kidman.

Andrews will put her voice acting skills to work to give life to Karathen --  who has been described as "a sea creature who can help assist Aquaman’s quest to broker a peace between Atlantis and the surface world".

Aquaman producer Peter Safran said he wanted the underwater monster to have a touch of elegance -- so of course, he had to cast the first lady of impeccable manners, Ms Julie Andrews.

“We wanted the Karathen to have the voice of a classic British actress, albeit somewhat digitally altered,” Safran told EW.

“And when we found out Julie was interested and available and excited to do it, casting her was a no-brainer," he added.

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Honestly, this sounds like it could be the role of a lifetime -- and possibly another Academy Award nomination for Andrews.

The 83-year-old has been very picky about the roles she's taken on in the last decade -- Andrews hasn't appeared on the silver screen since 2010's Tooth Fairy starring The Rock.

More recently, she's performed voice work for the Shrek and Despicable Me franchises and hosted the extremely adorable -- and educational -- Netflix series for kids, Julie's Greenroom. 

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The new Aquaman flick comes out in December, meaning it will be in direct competition with the new Mary Poppins reboot -- which Andrews won't appear in.

Mary Poppins Returns instead stars Emily Blunt in the classic role, plus Lin-Manuel Miranda,  Meryl Streep, Colin Firth and original cast member Dick Van Dyke.

Main Image: Getty/Warner