Transformers (2007):
A long time ago, far away on the planet of Cybertron, a war is being waged between the noble Autobots (led by the wise Optimus Prime) and the devious Decepticons (commanded by the dreaded Megatron) for control over the Allspark, a mystical talisman that would grant unlimited power to whoever possesses it. The Autobots managed to smuggle the Allspark off the planet, but Megatron blasts off in search of it. He eventually tracks it to the planet of Earth (circa 1850), but his reckless desire for power sends him right into the Arctic Ocean, and the sheer cold forces him into a paralyzed state. His body is later found by Captain Archibald Witwicky, but before going into a comatose state Megatron uses the last of his energy to engrave into the Captain's glasses a map showing the location of the Allspark, and to send a transmission to Cybertron. Megatron is then carried away aboard the Captain's ship. A century later, Captain Witwicky's grandson Sam Witwicky (nicknamed Spike by his friends)
Transformers Revenge of the Fallen (2009):
A youth chooses manhood. The week Sam Witwicky starts college, the Decepticons make trouble in Shanghai. A presidential envoy believes it's because the Autobots are around; he wants them gone. He's wrong: the Decepticons need access to Sam's mind to see some glyphs imprinted there that will lead them to a fragile object that, when inserted in an alien machine hidden in Egypt for centuries, will give them the power to blow out the sun. Sam, his girlfriend Mikaela Banes, and Sam's parents are in danger. Optimus Prime and Bumblebee are Sam's principal protectors. If one of them goes down, what becomes of Sam?
Transformers Dark of the Moon (2011):
Autobots Bumblebee, Ratchet, Ironhide, Mirage (aka Dino), Wheeljack (aka Que) and Sideswipe led by Optimus Prime, are back in action taking on the evil Decepticons, who are eager to avenge their recent defeat. The Autobots and Decepticons become involved in a perilous space race between the United States and Russia, to reach a hidden Cybertronian spacecraft on the moon and learn its secrets, and once again Sam Witwicky has to come to the aid of his robot friends. The new villain Shockwave is on the scene while the Autobots and Decepticons continue to battle it out on Earth.
Transformers Age of Extinction (2014):
After the battle between the Autobots and Decepticons that leveled Chicago, humanity thinks that all alien robots are a threat. So Harold Attinger, a CIA agent, establishes a unit whose sole purpose is to hunt down all of them. But it turns out that they are aided by another alien robot who is searching for Optimus Prime. Cade Yeager, a "robotics expert", buys an old truck and upon examining it, he thinks it's a Transformer. When he powers it up, he discovers it's Optimus Prime. Later, men from the unit show up looking for Optimus. He helps Yeager and his daughter Tessa escape but are pursued by the hunter. They escape and Yeager learns from technology he took from the men that a technology magnate and defense contractor named Joshua Joyce is part of what's going on, so they go to find out what's going on.
