Zac Efron Takes Center Stage In JFK Assassination Drama 'Parkland' Trailer

The ensemble film explores the FBI and Secret Service investigations in the hours after the shooting.

After the world was shaken by the assassination of President Kennedy in 1963, a group of people took on the task of figuring out what happened that day in Dallas. That's the story being told for multiple points of view in "Parkland," the new drama starring Zac Efron, Billy Bob Thorton, and Paul Giamatti.

In the first trailer, which just hit the web over at Yahoo! Movies, we see Efron as Jim Carrico, the first-year surgical resident who was the first doctor to attend to Kennedy upon his arrival to Parkland hospital on November 22, 1963.

Along with last year's "The Paperboy," this marks yet another more adult role for Efron as he attempts to transition into the next part of his movie career.

"Parkland" also focuses on the efforts of the Secret Service who are investigating Lee Harvey Oswalt and the infamous Zapruder film, the highest quality look at the shots that killed the president. Giamatti plays Abraham Zapruder, the man who made the home video recording. Thorton played Forrest Sorrels, a member of the Secret Service from the Dallas office that finds Zapruder and his film.

The trailer then shifts to the FBI agents in Dallas, one of whom is James Hosty, the man charged with investigating Lee Harvey Oswald, played here by Ron Livingston, before following Oswald's family, including his brother ("Iron Man 3's" James Badge Dale) and mother, played by Academy Award nominee for "Silving Linings Playbook" Jackie Weaver.

This all amounts to a large-scale ensemble picture that appropriately represents to confusing and complex nature of the events that day.

"Parkland" opens in theaters on September 20.