Megatron's History
Megatron is the main antagonist of the 2007 cartoon Transformers: Animated. He is the ruthless and charismatic leader of the Decepticons after having overthrown the previous and seemingly benevolent leader, Megazarak.
Using the rhetoric to free the Decepticons, he rallied up support to initiate the Great War, hunting for the sacred Cybertronian artifact, the Allspark, the powerhouse of Cybertronian life, continuing his search even after the war ended. Following a betrayal by his second-in-command, Starscream, Megatron went to a 50 year coma, who after his reawakening, became the archenemy of Optimus Prime, a young cadet
Past
Megatron was once a normal Decepticon living in Cybertron under the command of Megazarak, while Cybertron was ruled over by the Autobot High Council lead by its Magnus. Seeking to overthrow them, Megatron rallied up support from the Decepticons by promising them to free them from the Autobot tyranny, using the support to overthrow Megazarak. Now in command over the Decepticons, Megatron initiated the Great Uprising, starting the Great War. During the Great War, Megatron led many victories thanks to the use of chemical weapons to wipe out entire battlefields. However, Ultra Magnus gained an advantage through the use of Space Technology. Megatron then sought the Cybertronian artifact that hosts the life of Cybertron, the Allspark, and had civilian areas all across the planet bombed, causing thousands of civillian casualties, demanding the Allspark if the High Council wants it to stop, so Ultra Magnus hid the Allspark from both sides. Due to the bombings, Ultra Magnus starts Project Omega, having created large Autobots that transform to ships called the Omega Sentinels to help them fight the war. Upon knowledge of this, Megatron sends Lockdown to capture Intelligence Officer Arcee to extract the Activation Codes of Project Omega from her, however, thanks to Ratchet, Megatron can't get his hands on the codes. The Great War finally ends with the Battle for Iacon with the Autobots winning, to which Megatron accepts exile in exchange for amnesty during the Tyrest Accord.
Season 1
As revealed in "Transform and Roll Out", Megatron continued his search for the Allspark. Managing to locate it near a Space Bridge being repaired by a ship containing a repair team led by former Autobot cadet and Prime named Optimus Prime. Megatron tried to take it from the ship itself, but was betrayed by Starscream, who planted an explosive device on his back. Due to the explosion that crippled the Autobots' craft, Megatron's lifeless body crashed on Earth, contracting "space barnacles," while his disembodied head was found in rural Michigan by a young Isaac Sumdac in his parents' farm. Megatron's head subsequently became a keystone for Sumdac's various robotic creations, which he used to help built his own company, and convert Detroit into a technological metropolis within the next 50 years.
His head was not reactivated until "Home is Where the Spark Is", when Sari used her Allspark Key to open her father's door to his lab. The surge of the key's power reached Megatron's head, putting him back online. Upon reactivation, he immediately found out that it was Starscream who betrayed him, and immediately plotted to kill him, but he needed a body to do so. When he found out that the Autobots were on Earth, he took control of one of Sumdac's prototype pocket bots and sent it to their hideout — an abandoned automotive plant. Using the pocket bot, Megatron hacked the plant's automated systems to try and kill the Autobots, but his plan failed, and he would have been discovered by the Autobots if it weren't for Bulkhead accidentally destroying the pocket bot.
In "Blast from the Past", he revealed his existence to Professor Sumdac while he was repairing Sari's tutor-bot and the future Dinobots, which were accidentally destroyed by Bulkhead. Even though Sumdac wanted to tell the Autobots, Megatron convinced him that he was an Autobot and didn't want the real Autobots to see him in his weakened state. Eventually, Sumdac repaired the Dinobots with Megatron's "help". The Dinobots went on a rampage, got their new Cybertronian-like forms, and Megatron got his second taste of what Sari's key could do. He then proceeded to tell the Dinobots that the Earth cars were malevolent fossil feeders and the Autobots were even worse, sending them on another rampage.
In "Nanosec", he told Sumdac to hurry up with building a body and that he required Destronium (a play on the words cybertonium, the stuff all Cybertronians are made of and require in G1, and Destron, the Japanese name for the Decepticons), but the only Destronium available was across town, and if it wasn't delivered in under 10 minutes, then it would be futile. Upon hearing this, and seeing a test run with a super-speed suit developed by Sumdac Systems, Megatron secretly bailed petty thief Nino Sexton out of jail and supplied him with the super-speed suit, paying him to deliver the Destronium to him. Both Megatron and Sexton (now calling himself Nanosec), however, were unaware that if Destronium were moved at high speeds, it would become unstable, volatile, and catastrophically explosive. At the same time, Nanosec was unaware that the side effect of the suit's speed-enhancing ability was the wearer's rapid aging. Within minutes of continuously using the suit, Nanosec aged into an elderly man and was shortly apprehended while Bumblebee, using his rocket boosters and aided by Bulkhead and Prowl, disposed of the Destronium just outside Earth's atmosphere before it could explode and potentially take most of Detroit with it.
During "Sound and Fury", Megatron created Soundwave, originally a musical toy he created for Sari's birthday — even though his actual reason for creating Soundwave was to create a new body when Sari used her key to upgrade it. However, Sari used her key too many times and gave Soundwave a spark, and after hearing about this, Megatron convinced him to start a revolution to enslave and destroy humanity, all other organics, and the Autobots, whom Megatron said were "traitors who live to serve the humans."
After Lugnut and Blitzwing arrived on Earth during "Lost and Found", Megatron initially waited to see if they were truly loyal. After Lugnut and Blitzwing's battle, Megatron denounced Blitzwing as unstable and Lugnut truly loyal to the Decepticon cause, and spent the rest of the episode communicating exclusively to Lugnut, who Blitzwing thought was even more insane than himself.
In "Nature Calls", space barnacles wreaked havoc in a mining area outside Detroit, assimilating with a construction vehicle and becoming a techno-organic monster. The monster was defeated by Bumblebee, Prowl and Sari using hot water sprayed from a fire hose in the mine. It was revealed that the space barnacles had latched on Megatron's body, which crashed in the vicinity 50 years ago. Shortly after the space barnacles were destroyed, Sumdac found Megatron's body lying by the river and brought it back to his lab.
