Kendall Knight, James Diamond, Carlos Garcia, and Logan Mitchell are four high school hockey fans from Minnesota. They are given an opportunity by record producer, Gustavo Rocque, to move to Hollywood as part of his latest boy band project known as Big Time Rush. Along the way, they stay at the no-so-luxurious Palm Woods Hotel in Hollywood and face an uptight hotel manager, grueling recording sessions, corporate bureaucracy, crazed fans, meet girls, cause chaos, and go on other adventures. Kendall's mother and sister Katie join the four boys and have hilarious romps ...
Kendall, Carlos, James, and Logan are required to attend four hours at school. However, instead of going to school at the Palmwoods Hotel, which they all have their own fantasies about, Gustavo insists that they attend school at his recording studio, which operates out of a supply closet. Katie want to go to the Palmwoods School as well, but since the school is only for kids in the entertainment industry, she and her mother attempt an acting career by auditioning for television commercials.
The four "hockey heads" need some home improvement for their new apartment, despite the objections of Reginald Bitters, the Palm Woods manager. This couldn't possibly come at a worse time, because Arthur Griffin has warned Gustavo that RCM CBT Global-Net Sanyoid, the parent company of Rocque Records, is threatening to dump the entire music division. The proposal to do otherwise hinges on a video designed to make an impression on the company's aging Japanese CEO, starring the boys.
The company that owns Rocque Records insists that one of the members of BTR should take on a faux-bad boy persona. When neither of them are able or willing to be as bad as the company wants them to be, Griffin hires a fifth member named "WayneWayne" to join the band and show them what being bad is all about. Luckily, a casual observation by their teen method actress friend Camille makes them realize that even he's not worth all the hype, but is that enough to keep WayneWayne and his corporate-hired posse from replacing one of the boys?
RCM CBT Global-Net Sanyoid wants Gustavo to write a love song for the boys to perform, but they need inspiration. And that inspiration comes in the form of a new arrival at the Palm Woods Hotel - a pretty young girl named Jo Taylor who's has musical aspirations of her own. For Gustavo, writing the actual song proves to be far more difficult, and his ordeal is further compromised by the presence of Kendall's sister Katie, who has to write an essay for school on an adult she supposedly idolizes.
When Gustavo has to go away on business, he lets the guys house-sit his mansion. While the boys do their best to keep the house in pristine condition, they inevitably destroy everything inside that Gustavo values.
Gustavo thinks its time to build some hype around Big Time Rush and sets up an important interview with famous blogger, Deke. Deke has been known to make or break a career so the guys must get this right.
The kids at the Palm Woods Hotel want to throw a school dance party at Gustavo's recording studio, and he agrees upon the condition that the boys perform one song, and learn some new dance moves supplied by a flamboyant choreographer. Kendall and Katie decide to use this opportunity to get a date for their mother, while Jo tries seemingly in vain to invite him. James helps Logan invite Camille, and ends up getting more than several dates of his own. And all three of the Jennifers insist on inviting Carlos, on the condition that he impersonates three different boys... ...
The guys are continuing to live their Hollywood dream, however James, Logan & Carlos begin showing odd behavior. Logan has lost his uptight edge, Carlos wants to be one of the Jennifers, and James can't stop spray tanning and is now orange!
Rocque Records wants to make a music video for BTR's song "The City is Ours," and despite Gustavo's insistence that they do it his way, Kendall, James, Logan, and Carlos insist on giving parts in the video to all their friends... and more.
On the eve of their first album release Griffin dashes the boy's music dreams and they return home to Minnesota. Coming to terms with how their world has changed, the guys decide to take control and with Gustavo plan their first big concert.