Shawn Berger is an antagonist in the original Transformers cartoon show, appearing as a major antagonist turned anti-hero of the episode "Megatron's Master Plan". He is a very rich, greedy and grandiloquent man who owns a helicopter, a TV network, a personal army (with tanks), and at least one private spacecraft. And he is also a Decepticon-allied human who made a deal with Megatron by getting rid of the Autobots off of Earth and run for Mayor of Central City.
Prior to the events of the series, Shawn Berger ran for mayor in Central City in 1984, but he lost. He gave the new mayor a solar energy factory as a "gift" to the city. In truth, he secretly placed his hired troops inside in hopes he could be a hero of the people in case of a Decepticon attack. As he expected, the Decepticons attacked his solar energy factory during its opening and had his troops deployed to stop them, only to fail as they are no match for the Decepticons. The Autobots however, arrived and saved the day instead, with the mayor thanking them.
Berger witnesses this on TV and was enraged with the Autobots' interruption, since he badly wants to become the city's mayor instead. He orders his guards to leave his office to give him time to think. He picks up a nearby cassette, who then reveals himself as the Decepticon Laserbeak in disguise and kidnaps him. He brings the corrupt official to a nearby mountain ridge, where he is greeted by the Decepticon leader Megatron himself. The Decepticon leader offers him a deal that they can give him anything he wants, even two cities as he desired while in return, he will use his wealth, power and influence to help them. Megatron tells the corrupt official the "truth" about the Autobots as the "wicked conquerors" and the Decepticons as the "heroic liberators" and he badly needs evidence to prove this. Berger agrees to help and Dirge takes him back to his office, unaware of the consequences.
The next day, Berger hires a pilot and uses a news helicopter to look for the Autobots. He finds the "Autobots" (actually disguised Decepticons) in a nearby abandoned oil field, secretly stealing oil and overhears them. "Ironhide" spots them and warns "Optimus Prime", who then shoots the chopper. Megatron and the Decepticons arrive, "save" Berger and drive off the "Autobots". While Berger's chopper flees, "Wheeljack" shoots the camera off the chopper, before the item is caught by Dirge and gives it to Megatron, who claims the tape must be returned to Berger as it "contains valuable evidence".
During Autobot Day, the crowds cheer for the Autobots and Optimus prepares to give a speech, Berger goes to the video station and has the operator play the tape recordings in his possession, revealing the Autobots as "evil power hungry conquerors", including a video of the Autobots "draining" an abandoned oil field, fighting the "heroic" Decepticons and even a video of "Wheeljack" "brainwashing" the Coneheads, alongside a speech of Megatron "trying to save the humans". A majority of the public, with the exemption of Spike Witwicky, Sparkplug Witwicky and Chip Chase, believe the accusations and turn against the Autobots while accusing Spike, Sparkplug and Chip of being traitors. Berger, alongside the mayor who refuses to believe but has no other choice, has the Autobots rounded up and arrested and sent for trial where they are exiled out of Earth forever. Berger also provides the ship they rode for their exile.
With the Autobots now exiled back to their home, Megatron and Berger head to Autobot headquarters, where the latter witnesses the Decepticon leader reprogramming Teletraan-1 sending the Autobots's ship directly into the sun.
Now with the Autobots out of their way, Berger then declares the Autobot Day into Decepticon Day, with the Decepticons appreciated as heroes instead, and the Decepticons being accepted into society. Berger finally achieves his goals, but this was short lived as Megatron reveals his true intentions to drain Earth and enslave humanity while declaring martial law on Central City, which he renamed to Megatronia 1. Exposed, Berger is shocked by this by declaring it is over for the Autobots have been incinerated in the sun. Everyone, including his own personal guards, begin to despise Berger for his betrayal and selling humanity out to the Decepticons. In an attempt to redeem himself, he saves Spike from Laserbeak, who tries to kill him for proving the Autobots have been framed and ends up becoming one of the human slaves on the city, with the mayor claiming that Berger got what he deserved. As everyone blames him for their enslavement, Berger aids in Chip's escape from the Decepticon enforcers before being caught and punished.
Humanity's slavery was short lived as the Autobots, who turned out to have survived, return and defeat the Decepticons, freeing everyone including Berger. Apologizing for his mistakes, he tells Optimus that he would disband his personal army, only to be pointed out by Sparkplug that they have already abandoned him. Optimus tells him "You are going to face justice, and may it be kinder to you than it was to us." before ordering the Autobots to roll home. It is unknown what became of Berger after the event, but it is indicated he turned himself in for his crimes.
- Shawn Berger is the second human antagonist to form an alliance to the Decepticons, the first being Dr. Arkeville and Ali being the third.