Main Cast:
* Shia LaBeouf as Sam Witwicky
* Rosie Huntington-Whiteley as Carly Spencer
* Josh Duhamel as William Lennox
* Tyrese Gibson as Robert Epps
* Patrick Dempsey as Dylan Gould
* John Malkovich as Bruce Brazos
* Frances McDormand as Mdm. Anya Kovacs
Supporting Cast:
* Kevin Dunn as Ron Witwicky
* Julie White as Judy Witwicky
* John Turturro as Agent Simmons
* Buzz Aldrin as himself
* Leonard Nimoy as Sentinel Prime (voice)
* Ken Jeong as Jerry Wang
This list includes both the main actors and those who played key supporting roles in the film.