From there, it's a race for both sides to find Sam and get the AllSpark. Sam Witwicky (voiced with appropriate 'gee whiz!'-ness by Shia LaBeouf) is an average teenager who happens to hold the key to finding the AllSpark. The AllSpark is essentially the life force for all Transformers, which explains why they'd want to get it back.
The classic Transformers battle between good robots and evil robots has spilled over to planet Earth as the two warring sides search frantically for an artifact known as the AllSpark. The basic premise of the game is the same as the film's. If you were hoping for something more, Transformers will probably just disappoint you. If that's all you want out of the game, then Transformers might provide you a few mild hours of entertainment. It is simply an excuse for fans of the upcoming live action film (and maybe even some fans of the old cartoons who, admittedly, will take pretty much anything they can get at this point) to run around, awkwardly beating up Autobots or Decepticons in various semidestructible environments. It's got all the hallmark problems of the genre, including short length, overly simplistic mechanics, a barely-there story, and a bit of a sloppy feel. Transformers: The Game is very much the archetypal movie-licensed game.