Wikipedia
The film is about Bolt (John Travolta), a small white German Shepherd who has lived all his life on the set of a TV show in which he portrays a superhero dog. As a result, he thinks that his superpowers, and events on film, are real. When he is accidentally shipped from his Hollywood soundstage to New York City, he embarks on a cross-country journey to reunite with his owner and co-star, Penny (Miley Cyrus). Along the way, Bolt teams up with a jaded housecat named Mittens (Susie Essman) and a TV-obsessed hamster named Rhino (Mark Walton) that also happens to be an extreme Bolt fanboy, and eventually he discovers that he doesn't need superpowers to be a hero.
Yahoo Movies
For super-dog Bolt, every day is filled with adventure, danger and intrigue - at least until the cameras stop rolling. When the canine star of a hit TV show is accidentally shipped from his Hollywood soundstage to New York City, he begins his biggest adventure yet - a cross-country journey through the real world. Armed only with the delusions that all his amazing feats and powers are real, and with the help of two unlikely traveling companions - a jaded, abandoned housecat named Mittens and TV-obsessed hamster in a plastic ball named Rhino - Bolt discovers he doesn't need superpowers to be a hero.
Official Site
More than just man's best friend, Bolt is a moden-day action hero. Raise on a set of a hit television show, Bolt believes he has amazing powers - like a devastating Superbark !
But when he's accidentally shipped to New York City, Bolt's daredevil stunts no longer go according to plan. As reality begins to challenge his delusions, Bolt learns his whole life has been a lie. Or has it? Amidst the adversity and hard-knocks, Bolt will discover that a dog's trues superpower lies in his loyalty to the owner he loves.