The Decepticons are a faction of Cybertronians who formed on Cybertron, They fight to destroy the heroic faction The Autobots. The Decepticons were founded by The Fallen (Megatronus), who were founded again by Megatron some time later, and he would start the Cybertronian War. Unlike the Autobots, who mostly value allegiance, loyalty, and friendship, (an exception for Sentinel Prime) Decepticons had, and still have, no feelings towards each other. This was shown in ROTF, when the Decepticons wanted to revive Megatron, and they needed parts. So what did they do? They killed and ripped apart the body of the smallest Decepticon among them, Scrapmetal.
The Decepticons actually started with one Cybertronian, who once was one of the original seven Primes, his name was The Fallen, who was formerly known as Megatronus Prime. When the original Primes found the AllSpark, they realized they needed a power source for it, for as the AllSpark created life, it too, did not have unlimited energy. The Primes would eventually end up figuring out that in order to power the AllSpark, they needed to harvest Energon, from suns. The Primes, however, had one rule: never harvest Energon from a sun with an inhabited planet. Megatronus despised this rule, believing that Cybertronians were the ultimate race. This, combined with his hatred for the human race, led him to choose to ignore this rule. He gathered up a large group of like-minded Cybertronians and named them Decepticons. (Fun fact: the Decepticon logo is based upon the fearsome visage of the Fallen). This is why Megatronus is also known as the Original Decepticon.
Thousands of years ago, Megatronus and his Decepticons then start to construct a Star Harvester on Earth, in prehistoric Egypt, and killed any humans who discovered the Harvester. The Primes discovered what Megatronus had done and went to Earth to confront him. They launched a full on assualt on the Decepticons. The battle was ferocious, Megatronus fought with the other Primes, and while Megatronus was stronger than his brothers and they could not kill him, they imprisioned him and took the Matrix of Leadership from him (the Matrix was also the only way to activate and use a Star Harvester). They then sealed the Matrix in a tomb made of their own bodies, their ultimate sacrifice to save the Earth, Megatronus would forever more be known as the Fallen, and the Decepticons would then disband and the name would never be used or heard of again, until many years later.
Many years have passed on Cybertron since Megatronus' dreadful actions, Cybertron was at peace, and their Leader Sentinel Prime had just stepped down to let the future actions of Cybertron be determined by the Cybertronian science division known as Autobots, which was led by a Cybertronian scientist named Optimus, and the Cybertronian military, which was led by Megatron. Optimus and his science division were at an expedition digging for old Cybertronian Relics linked to their past when Megatron came flying towards them and asked Optimus how the dig was going, Optimus stated that it was fine and that they found a strange relic in the ground that could be linked to their past. Megatron ordered it to be dug out and returned to his quarters Optimus insisted it be taken to the Science institution for study, and just as Megatron and Optimus were about to argue, they saw the city was under attack from an unknown alien race who sought the energy of the AllSpark, Megatron ordered that the Science division move out of the Expedition and flew off to deal with the invaders.
When Megatron arrived at the scene, Bumblebee and Cliffjumper were on the defensive while guarding the AllSpark, Megatron critized them for not going on the offensive, while speaking he was shot in the shoulder by a tank, he dealt with it quickly when Starscream came to ask if he was fine. Megatron told Starscream he was fine and when Starscream asked about Bumblebee and Cliffjumper and what they were supposed to do, Megatron said "to stay out of our way", after the battle Megatron limped his way to his quarters, as instructed the artifact the Science division discovered was in his quarters, as Megatron grew more weak, he started to fall, when he fell for what was thought to be his last movement, it was in front of the artifact, but this artifact was strange for it, it started to speak to Megatron.
The first thing Megatron heard was a voice in his head telling him to wake up, the voice repeated this and Megatron rose, demanding to know who the voice was, the voice first asked him who he was, Megatron told the voice "I am Megatron, defender of Cybertron, and no one-" Megatron was cut off when the voice spoke to him, when Megatron looked at the artifact it had a strange visage on, the voice spoke to him and explained who he was. The voice had come from the artifact, and the artifact was the very prison in which the original Primes had imprisoned Megatronus, who was now known as the Fallen.
The Fallen explained all the history of him, the Primes, the Star Harvester, and more, the Fallen told Megatron that he needed to find the Star Harvester which he had constructed so long ago and that Megatron would help him find it, and in return, he would grant him tremendous power and rule over Cybertron, Megatron accepted and became his apprentice. Now the apprentice of the Fallen, Megatron decided to launch a full-scale attack on the alien ships that flew over their planet.
With the entire Cybertronian military at his command, Megatron led the attack and triumphed. Optimus questioned the reasoning behind this and went to Megatron's quarters to find some answers. when Optimus, Jazz, and Prowl entered Megatron's quarters, they found nothing, and when Optimus found the artifact, the visage was gone, but the symbols on the side weren't. Optimus said to himself "Megatron must have cleaned it up" before leaving, later, after study from Ratchet, they would discover the symbols on the artifact and similar artifacts would have the same symbols, Optimus in turn would have these symbols, and that they are the symbols of the Primes, thus making Optimus, Optimus Prime.
When Megatron returned, the Fallen told Megatron that Optimus had been here, after he was informed, Megatron decided it was time for action, the Fallen told him "Cybertron will be yours, everything else will be mine". Megatron would later gather Cybertronians who were loyal to him in the city of Trypticon, he stated that they would give Cybertron the rule it deserved and branded him and his follower Decepticons, looks like the Decepticons are making a comback. Many more years have passed since Megatron and the AllSpark left Cybertron, and both Autobots and Decepticons decided it was time to leave.
The Decepticons arrived a while after Bumblebee and HotRod, they make their presence known by having Blackout attack a military base in Qatar to find information on the whereabouts of Megatron and the AllSpark, which both seemingly have crashed here. Frenzy searches the files again on Air Force 1 after Blackout's connection was cut by the humans, Air Force 1 lands on the ground and Frenzy meets up with Barricade, who is disguised as a police car. Frenzy tells him they need to find Ladiesman217, which is the eBay username for Sam Witwicky. Barricade's attempt at finding the glasses that can lead the Decepticons to the AllSpark and Megatron from Sam is stopped when Bumblebee comes and gets Sam away from Barricade. The Decepticons begin their attack on mission city when Starscream attacks a civilian truck and costs Bumblebee his legs. The second wave of the attack shows Brawl firing at the human military, Brawl unfortunately already suffered a casualty after his rocket launcher was kicked off by Jazz, his arm getting cut off by Ratchet, and suffers a painful death after getting blasted in the spark multiple times by Bumblebee. Blackout arrives on the scene only to be shot in the crotch and bleed to death not much later by Major Lennox. The ultimate showdown between Optimus Prime and Megatron begins, and ends with Sam pushing the AllSpark into Megatron's chest, overriding his spark with energy, killing him, leaving only Starscream, who retreats into space to go to the Nemesis, which has crashed on one of Saturn's moons, and there he finds the Fallen on the ship, Starscream sends Decepticons back to Earth while he helps the Fallen build his new army.
Two years have passed since Megatron was killed by the AllSpark with only two shards of the AllSpark remaining. The Decepticons continue to act on the orders of the Fallen in order to find the Matrix of Leadership, all-the-while, Starscream continues to oversee the spawning of a new Decepticon army. After listening in on a private converstation about the whereabout's of Megatron's body and the location of an AllSpark shard, Soundwave deployed the Decepticon Ravage to steal one of the shards, and with the help of Long Haul, Scrapmetal, Mixmaster, and Rampage, they revive Megatron. Megatron then leaves the Baltic sea to head for the Nemesis and encounters Starscream, reclaiming control from him after intimating the henchman. Megatron then meets with the Fallen directly, and questions their plans for creating more energon following the destruction of the AllSpark. The Fallen reveals to Megatron that Sam has absorbed knowledge from the AllSpark on the whereabouts of the Matrix of Leadership. In addition, the Fallen tasks Megatron to kill Optimus Prime to ensure their plans are successful. Megatron later captures Sam and probes his mind to reveal the information, addtionally, luring Optimus and the Autobots to rescue Sam. Megatron, Grindor, and Starscream isolate Optimus from the other Autobots and fight him. Despite heavy ressiantace and the death of Grindor, Megatron is successful in killing Prime.
Following the death of Optimus Prime, the Decepticons arrive at Egypt with more numbers than in mission city, the first sign of their presence is the destruction Starscream causes around the place while the Decepticons look for Sam and the Matrix of Leadership. A battle insues between the two sides, to serve as a distraction, meanwhile, the Constructicons combine to form the massive Decepticon Devastator. Devastator unearths the Star Harvester from within the pyramid, but he is killed by an expiremental military railgun. Despite activating the Star Harvester, it is quickly destroyed by the newly ressurected Optimus Prime. A final fight breaks out that ends in the death of the Fallen. All that's left is a a wounded Megatron and Starscream, and they retreat into hiding, not to be seen for two more years.
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