Grab your earplugs: Miley Ray Cyrus and John Travolta are rumoured to be singing a duet in the upcoming Disney film Bolt. Movie comes out November 26th.

It's not enough that John Travolta and Miley Cyrus (Hannah Montana) are voicing the leading roles in the upcoming Disney animated film Bolt, but they may also sing a duet in the flick.

Travolta's wife Kelly Preston told E! that “Johnny may sing with Miley” at some point in the film. According to Preston, she and Travolta met Cyrus when she opened for the Cheetah Girls two years ago. Preston and Travolta's 8-year-old daughter Ella is a fan of the singer.

“We know Miley very well,” Preston said, “and she’s a sweetheart.”

Since Bolt hasn't been billed as a musical, it's not known where a proposed Cyrus/Travolta duet would be placed within the film. The credits perhaps?

What's Bolt about?

"Bolt is owned by a little girl whose father is this incredible scientist," said Disney Animation creative head John Lasseter at a February 8, 2007 investor conference. "Now, to protect the little girl, he gives the dog superpowers, but the dad is kidnapped . . . and the dog is protecting her by fighting off the bad guys with his superpowers, and for 10 years they search for the father and battle the bad guys.

"But all this is actually a TV show . . . Bolt is a star of the most popular television show . . . but he thinks this is real. In one unfortunate incident . . . he's shipped from his home on the soundstage to New York City and he comes out of it and he thinks it's all part of his life, where he has superpowers.

"But he is in the real world and nothing works like he thinks . . . he's trying to figure out what the heck is going on with the help of this crazy alley cat (voiced by Susie Essman) and this super fan hamster (Mark Walton) who is always in his hamster ball . . . (Bolt) realizes that he is just an actor on a TV show, that his entire life . . . has been spent being a fake, that he is not really what he thinks he is. It crushes him, but, really, he learns what it is to be a true dog."

Malcolm McDowell (A Clockwork Orange), Dietrich Bader (Surf's Up) and former WWE wrestler Randy Savage also voice roles in the flick.

Bolt controversies

This flick has probably the most worrying pedigree of any of Disney's upcoming animated films. Chris Sanders (Lilo and Stitch) conceived the idea while he was with Disney but John Lasseter handed the film to Chris Williams (Mulan) and Byron Howard after Lasseter and Sanders had a falling out.

Many people felt that Lasseter made a mistake by dropping Sanders, a view propagated when the first promo stills for Bolt hit the Interweb. Cartoon Brew's Amid Amidi went so far as to denounce them as "embarrassingly bland and uninteresting," saying, "I can’t imagine this exciting many people to want to see this film."

The casting has also been called into question. As an actor, Travolta has had possibly the most up-and-down career in Hollyweird, with every hit (Pulp Fiction, which won the 1994 Palme d'Or at the Cannes Film Festival) accompanied by a disaster (Battlefield Earth, which swept the 2001 Razzies).

As for Miley Cyrus, her acting resume is surprisingly skimpy, with only one role (a Mudka's Meat Hut Waitress in 2007's The Emperor's New School) where she didn't play herself, or her onstage alter ego Hannah Montana.

Bolt makes its theatrical debut on November 26th.

Fun Fact: Miley Ray Cyrus is the daughter of formerly mulleted country crooner Billy Ray Cyrus, whose #1 song "Achy Breaky Heart" was unavoidable in the early 1990's. Despite being frequently tagged as a "one-hit wonder," Cyrus actually had 13 songs in the Top 40.

Billy Ray fathered two children at approximately the same time: Miley with Leticia Finley (they were not married at that point) and Cody, conceived with an as-yet unidentified woman.