When director Michael Bay said he was done making giant-alien-robots-from-space movies after Transformers: Dark of the Moon, we combed through the trilogy of films to generate the most complete Transformers Character Guide available. But then Bay changed his mind and made a fourth film anyway - meaning, our guide isn't so complete anymore.
Rather than add to our original list, we decided to create a whole new list for what will likely be a new trilogy - beginning with Transformers: Age of Extinction. We've divided this list into three main categories - Autobots, Decepticons and Dinobots - have included images of each (from the movie when possible), as well as brief descriptions.
****WARNING: THIS POST CONTAINS SPOILERS****
Voice Actor: Peter Cullen
Optimus Prime is the wise and formidable leader of the Autobots. He called his comrades to Earth to help protect humans from the onslaught of Decpticons; however, the human population turned on all Transformers, so the Autobots went into hiding.
In the early stages of the fourth film, Optimus is a rusty, beat up, Marmon cab-over truck, but later he takes the form of a Western Star 4900 custom semi-truck. Once he has broken in the Dinobot known as Grimlock, he'll ride on his back in an effort to defeat the Decepticons - and a new type of enemy, as well.
Voice Actor: None
From the beginning, Bumblebee has been one of Optimus Prime's most loyal lieutenants and a sworn protector of the human race. Even though his voice module was damaged beyond repair, Bee still manages to communicate effectively using his radio to play various songs and soundbites that relate to the situation at hand.
He alternates forms in the movie, starting as a 1967 Chevrolet Camaro but later becoming a sleek and shiny 2014 Camaro. In robot mode, he'll be carried by the aerial Dinobot, Strafe.
Voice Actor: Robert Foxworth
While Ratchet is a valuable member of the Autobot team (he serves as their medic), he's not a fighter by naturet. Instead, he chooses to be on their side because he feels only the Autobots truly have a chance at achieving peace - the only thing he really cares about.
Further enhancing his peace-loving and medic ways, he takes the form of a 2004 Hummer H2 ambulance.
Voice Actor: John Goodman
Hound is new to the Transformers movie franchise and makes his debut appearance in Transformers: Age of Extinction. In the comics and animated series, Hound is a gentle being who loves calling Earth his home and he often explores all its beautiful places as an Autobot
The cartoon version was a Jeep-turned-robot with a shoulder-mounted rocket and the ability to project holograms; in the film, he is more of a heavy artillery gunner with a robotic beard and penchant for biting on bullets like they're cigars. His alternate form is a Oshkosh Defense Medium Tactical Vehicle.
Voice Actor: John DiMaggio
The animated version of Crosshairs is the Autobots weapon master - meaning his appearance in Age of Extinction makes sense, since the Autobots' last weapons specialist, Iron Hide, was killed by the turncoat Sentinel Prime. Crosshairs isn't a fan of Earth, and given his way, would leave it behind and not look back.
Crosshairs' alternate form is that of a 2014 Chevrolet C7 Corvette Stingray, and he saddles up on the Dinobot called Scorn.
Voice Actor: Ken Watanabe
In the comics, Drift was once known as the Decepticon Deadlock, but then he converted to the Autobots team. In the film, he's a meditative Samurai who's skill with deadly "spark swords" is virtually unrivaled.
When Drift isn't flying above the city disguised as a helicopter, he likes to "drift" through the streets in his alternate form of a 2013 Bugatti Veyron Grand Sport Vitesse. His Dinobot companion is Slug.
Voice Actor: Reno Wilson
Like Drift, Brains was once a member of the Decepticons - specifically, a data-gathering drone for Soundwave - but after seeing the error of his ways (or perhaps he was just tired of being bossed around) he switch sides and became an Autobot. In this film, he is captive of humans looking to crack to the Transformer genome.
He can transform into a laptop but is rarely seen in that mode.