Fulfilling expectations with lengthy battle scenes, gripping action sequences and convincing special effects, Transformers pleasantly surprises viewers with unexpected humor and realistic, likable characters.

Based on a line of Hasbro brand toys, the film interpretation released July 4 combines the story of a normal teenage boy with an epic battle between two factions of robotic transformers. As Sam Witwicky (Shia LaBeouf) tries to get good grades, a car and a girlfriend, he is unwittingly drawn into the alien conflict and must join forces with the humanitarian Autobots to (yes) save the world.

Transformers develops in a fragmented style, switching between two separate plot lines: Sam's life and emerging friendship with the Autobots and the military's encounters with the evil Decepticons. At first the movie seems unbalanced, with separate scenes seemingly unconnected to each other, each with heavily contrasting tones. It is hard to decide whether Transformers is trying to be a serious military drama, a light teen romantic comedy or a sci-fi thriller. Despite the somewhat clashing nature of a somber battle scene followed by cliché teenage antics, the ultimate effect is successful — both sections develop to be independently interesting, engaging and related to the central plot.

Perhaps the film's greatest success is its unremarkable special effects — so unremarkable that the audience forgets the giant car-robots are not real. More than half of the movie is dedicated to action-packed CG battle scenes, leaving the audience tense and breathless by the end of the two-and-a-half-hour film.

The intense fighting is interspersed with scenes of the developing romance between Sam and his crush Mikaela (Megan Fox). While this teenage courtship makes for a welcome reprieve from the constant fighting, the teens' interactions are often exaggerated and cheesy. Attempting to be serious, the romance becomes laughable when in the midst of a battle, the camera pans haltingly over Mikaela's bright, gleaming face as she yearningly looks at Sam, and later when they stop to have a lingering moment together while the fate of humanity depends on speed.

Despite the occasional predictable and unrealistic moments, the characters are genuinely likable and funny, supporting the strong and interesting, albeit formulaic plot. Sam's family lights up the middle of the movie with hilarious exchanges relating to the seriousness of saving humanity. Even the robots are characterized so well that they seem human and partake in their share of wit and comedy.

Like many stories of heroic battle and superheroes, Transformers features undertones of morality, often delivered in monologues by Optimus Prime, the leading Autobot. Accompanying the robot's tacky speeches on the importance of human life and kindness, Sam learns the gravity of his father's advice, "no sacrifice, no victory," and all the characters realize that in many situations there is "more than meets the eye" (a direct tribute to the television cartoon's theme song: "Transformers/More than meets the eye/Transformers/Robots in disguise").

While engaging, Transformers may merely be a creative way to charge people to watch an infomercial: the movie features multitudes of transformers and cars, making even the main characters just product placement with a personality. The entire two-and-a-half hour film encourages children to buy the original Hasbro transformer toys and their parents to buy new Cameros.

Whether an elaborate commercial or an epic tale of the battle to save humanity, Transformers begins in outer space with a storytelling style reminiscent of Star Wars, and ends with a robot looking off into the sky waiting for the next battle; the audience is left waiting for the guaranteed sequels.