The main actors from the movie Transformers are Shia LaBeouf, Megan Fox, Josh Duhamel, Tyrese Gibson, Rachael Taylor, and Anthony Anderson, with Peter Cullen and Hugo Weaving leading the robot voice cast. If you are trying to match a face, a character name, or a robot voice from the 2007 film, it helps to separate the cast into three groups: Sam's civilian storyline, the military/government storyline, and the Autobot-Decepticon voice performances.
Main actors in Transformers (2007)
The main live-action cast carries the film's human story. Sam and Mikaela give the movie its teenage adventure angle, while Lennox, Epps, Maggie, and Glen connect the plot to the military and government response.
Shia LaBeouf as Sam Witwicky
Shia LaBeouf plays Sam Witwicky, the teenager whose family history makes him important to both the Autobots and Decepticons. Sam is not a soldier or scientist, which is the point: he reacts like an overwhelmed kid suddenly pulled into a war between giant machines.
LaBeouf gives the role nervous speed, awkward humor, and enough panic to make the huge action scenes feel closer to the viewer. For many people, he is the face of the first live-action Transformers era.
Megan Fox as Mikaela Banes
Megan Fox plays Mikaela Banes, Sam's classmate and eventual ally. Mikaela is often remembered for the romance storyline, but within the film she also brings practical car knowledge and a calmer attitude when Sam is spiraling.
Josh Duhamel as William Lennox
Josh Duhamel plays Captain William Lennox, one of the key military figures in the film. His scenes show the threat from the ground level: soldiers trying to survive, report what they have seen, and respond before anyone fully understands what the Decepticons are.
- Best remembered for: the military survival and battle-response scenes.
- Why the role matters: Lennox makes the robot conflict feel global, not just personal to Sam.
- Sequel relevance: Duhamel became one of the recurring human faces of the franchise.
Tyrese Gibson as Robert Epps
Tyrese Gibson plays Technical Sergeant Robert Epps, a member of Lennox's team. Epps gives the military storyline more personality because he is not just another soldier in the background; he has quick reactions, clear confidence, and a natural rapport with Lennox.
Rachael Taylor as Maggie Madsen
Rachael Taylor plays Maggie Madsen, a government analyst who notices unusual cyber activity linked to the Decepticons. Her role gives the story a tech-intelligence angle, showing that the alien threat is not only physical but also digital.
Maggie is useful for viewers who are tracking the plot rather than only the action. She helps connect the hacking, signals, and government panic in a way that keeps the larger crisis understandable.
Anthony Anderson as Glen Whitmann
Anthony Anderson plays Glen Whitmann, the hacker Maggie turns to when the situation becomes too strange for normal channels. Glen brings comic energy, but he also helps move the cyber-threat subplot forward.
His scenes have a different rhythm from the military and Sam storylines, which gives the movie a break from nonstop action. Anderson makes Glen memorable because the humor still has a plot purpose.
Supporting actors in Transformers (2007)
The supporting cast fills out the world around the main characters. Some roles are comic, some are official, and some only appear briefly, but they help explain why the 2007 movie feels busier and more lived-in than a simple "boy meets robot" story.
For a quick rewatch or cast check, these are the names that often solve the "where do I know that actor from?" question. The smaller parts are especially easy to forget because the film moves quickly between Sam's home, Sector Seven, military operations, and government rooms.
John Turturro as Agent Simmons
John Turturro plays Agent Simmons, the intense Sector Seven agent who brings secrecy, paranoia, and oddball comedy into the story. Simmons could have been a plain government-obstruction character, but Turturro makes him strange enough to stand out.
His role also connects Sam and Mikaela to the hidden government knowledge about the Transformers. Without Simmons, the jump from teenage adventure to secret-agency conspiracy would feel much rougher.
Jon Voight as John Keller
Jon Voight plays Secretary of Defense John Keller. Keller gives the film a higher-level government perspective, especially when the Decepticon threat becomes a national security crisis.
Voight keeps the role steady rather than flashy. That works because Keller's job in the movie is to make the command-center scenes feel serious and organized while the rest of the plot becomes increasingly chaotic.
Kevin Dunn as Ron Witwicky
Kevin Dunn plays Ron Witwicky, Sam's father. Ron's scenes are domestic comedy, but they also make Sam's life feel normal before Bumblebee and the Autobots take over.
For viewers checking the cast after a family-scene rewatch, Dunn is the actor behind the awkward, well-meaning dad energy that sets up Sam as an ordinary teenager rather than a ready-made action hero.
Julie White as Judy Witwicky
Julie White plays Judy Witwicky, Sam's mother. She brings loud, embarrassing-parent comedy to the film, especially in scenes where Sam is trying to hide how strange his life has become.
- Function in the movie: keeps the Witwicky home scenes funny and human.
- Why she stands out: White commits fully to the exaggerated family-comedy tone.
Bernie Mac as Bobby Bolivia
Bernie Mac plays Bobby Bolivia, the used car salesman who sells Bumblebee to Sam. It is a short appearance, but it is one of the easiest supporting roles to remember because Bernie Mac gives the scene such a strong comic stamp.
Michael O'Neill as Tom Banacheck
Michael O'Neill plays Tom Banacheck, a government figure involved in the official response to the Decepticon threat. He is not one of the loudest characters, but his presence helps the government side of the story feel more believable.
Banacheck is the kind of role viewers may not name immediately, yet it supports the film's chain-of-command scenes. O'Neill gives those moments a controlled, official tone.
Amaury Nolasco as Jorge Figueroa
Amaury Nolasco plays Jorge Figueroa, part of the military unit featured in the early desert attack sequence. His role helps sell one of the film's first major danger signals: these are trained soldiers, yet they are facing something they cannot easily identify or stop.
If you are remembering the early combat scenes rather than the later city battle, Nolasco belongs to that part of the ensemble. His performance adds urgency to the military team before the plot fully explains what they are up against.
Voice actors in Transformers (2007)
The robot voice cast is just as important as the live-action cast because the Autobots and Decepticons needed to feel like characters, not only visual effects. Strong voices help viewers quickly tell who is noble, threatening, loyal, sarcastic, or unstable.
There are two common reasons people check the voice cast: longtime fans want to know which classic voices returned, while casual viewers often want to identify the actors behind Optimus Prime, Megatron, Bumblebee, or the smaller Decepticons.
Peter Cullen as Optimus Prime
Peter Cullen voices Optimus Prime, leader of the Autobots. His return was a major point for longtime Transformers fans because Cullen had already been closely associated with Optimus in earlier franchise media.
Hugo Weaving as Megatron
Hugo Weaving voices Megatron, the main Decepticon villain. His performance gives Megatron a hard, commanding sound that fits the 2007 film's darker and more aggressive version of the character.
Megatron has limited time to establish dominance once he becomes fully active, so the voice has to do a lot quickly. Weaving makes him feel dangerous without turning him into a cartoonish villain.
Mark Ryan as Bumblebee
Mark Ryan is commonly credited with Bumblebee's vocal performance contribution, although Bumblebee mostly communicates through radio clips rather than normal speech in the film. That makes the role unusual: the character has to feel expressive without traditional dialogue.
Bumblebee's personality comes through timing, sound, movement, and reaction. Ryan's contribution helped make him feel loyal, playful, and emotionally clear even when he was not speaking in full sentences.
Darius McCrary as Jazz
Darius McCrary voices Jazz, one of the Autobots. Jazz does not have as much screen time as Optimus or Bumblebee, so the voice needs to establish personality fast.
- Character impression: cool, confident, and stylish.
- Why the voice matters: it helps Jazz stand apart from the other Autobots quickly.
Robert Foxworth as Ratchet
Robert Foxworth voices Ratchet, the Autobots' medic. Ratchet's role is more practical than dramatic, and Foxworth gives him a calm, capable sound that fits a technical support figure within the team.
Not every robot needs the biggest personality. Ratchet helps make the Autobots feel like a functioning group with different jobs, not just a lineup of similar machines.
Jess Harnell as Ironhide and Barricade
Jess Harnell voices both Ironhide and Barricade. That is easy to miss because the characters sit on opposite sides of the conflict: Ironhide is an Autobot with a rough battle-ready edge, while Barricade is a Decepticon with a more threatening presence.
The useful thing to notice is the separation. Harnell gives each role a different feel, which helps the action stay readable when several robots are moving and speaking in quick bursts.
Charlie Adler as Starscream
Charlie Adler voices Starscream, one of Megatron's key Decepticon allies. Starscream is a recognizable name in the wider Transformers franchise, and Adler gives this version a sharp, aggressive sound.
The 2007 film does not pause for deep Decepticon character study, so voice texture becomes important. Adler's performance helps Starscream feel like a distinct threat rather than just another flying enemy.
Reno Wilson as Frenzy
Reno Wilson voices Frenzy, the smaller Decepticon known for infiltration, chaos, and frantic movement. Frenzy is not meant to feel powerful in the same way as Megatron; he is unsettling because he is fast, strange, and unpredictable.
Wilson's vocal work supports that energy. The result is a Decepticon who feels different from the larger robots and gives the villain side more variety.
Conclusion
The cast of Transformers (2007) works best when you view it as an ensemble: Shia LaBeouf and Megan Fox anchor the civilian adventure, Josh Duhamel and Tyrese Gibson carry the military side, and Peter Cullen, Hugo Weaving, and the rest of the voice cast give the robots their identities. If you only remember one thing, remember that the film's impact came from both faces on screen and voices behind the CGI.