<P> Bolt reaches the studio and finds Penny embracing his lookalike, unaware that Penny still misses him and her affection for the lookalike is only a part of a rehearsal . A broken - hearted Bolt leaves, but Mittens, on a gantry in the studio, sees Penny telling her mother how much she misses Bolt . Mittens follows Bolt and explains . At the same time, the Bolt - lookalike panics during the show's filming and accidentally knocks over some flaming torches, setting the sound stage on fire with Penny trapped inside . Bolt arrives and the two reunite inside the burning studio, but are unable to escape before Penny begins to suffocate from the smoke . Penny begs Bolt to go but Bolt refuses to leave her . Bolt uses his "superbark" through the building's air vent, alerting the firefighters to their location and allowing both of them to be rescued in time . </P> <P> Penny and her mother quit when their overeager agent proposes they exploit the incident for publicity purposes . The show continues with a replacement "Bolt" and "Penny" and a new storyline involving alien abduction . Penny adopts Mittens and Rhino, and she and her family move to a rural home to enjoy a simpler, happy lifestyle with Bolt and her new pets . </P> <Ul> <Li> John Travolta as Bolt </Li> <Li> Susie Essman as Mittens </Li> <Li> Mark Walton as Rhino </Li> <Li> Miley Cyrus as Penny <Ul> <Li> Chloë Grace Moretz as Young Penny </Li> </Ul> </Li> <Li> Malcolm McDowell as Dr. Calico </Li> <Li> Nick Swardson as Blake </Li> <Li> Diedrich Bader as Veteran Cat </Li> <Li> Greg Germann as The Agent </Li> <Li> James Lipton as The Director </Li> <Li> Randy Savage as Thug </Li> <Li> Kari Wahlgren as Mindy </Li> <Li> Grey DeLisle as Penny's Mother </Li> <Li> J.P. Manoux as Tom </Li> <Li> Brian Stepanek as Martin </Li> <Li> Jeff Bennett as Lloyd </Li> <Li> John DiMaggio as Saul </Li> <Li> Jenny Lewis as Assistant Director </Li> </Ul> <Li> John Travolta as Bolt </Li>

Who does the voice for the girl in bolt