Omega Supreme is one of the largest Autobots there is. He isn't much for words, preferring his massive frame and equally massive weapons to do the talking for him. Omega is the last line of defense for the Autobots, a titanic guardian robot capable of instilling fear and panic into the sparks of Decepticons that dare face him on the field of battle.
Except Buzzsaw. Kill that little guy, it just makes him angry.
|“||Omega Supreme: always prepared.||”|
—Omega Supreme, "Blaster Blues"
Omega was one of the many Autobots who just showed up during the second season. Unlike most, however, he was actually given an origin.
Omega Supreme is the last surviving member of the legendary Guardian Robots, the massive neutral defenders of Cybertron. While he was defending the Crystal City, he befriended the Constructicons, the city's creators. However, as it would happen, the Constructicons were attacked by Megatron's Robo-Smasher and converted into Decepticons. The now-evil Constructicons convinced Omega to leave his post to help defend another city, and promised to look after the city in his stead. When he left, they demolished the Crystal City to Omega Supreme's horror. He captured them and tried to change the builders back into Autobots, but the process was irreversible and the treacherous Constructicons lured Omega into an ambush by the Smasher. The Robo-Smasher attacked Omega, but it was destroyed before it could convert him. Omega later recounts, "I lived, but, changed. Since then, I feel only hate for the Constructicons." It is thus possible that Omega's cold, emotionless demeanor -- quite different than he behaved before the destruction of the Crystal City -- is a direct result of the Robo-Smasher's work. However, it may also be that he has merely retreated into himself and become withdrawn because of the pain of betrayal and guilt.
Some time after these events transpired, the Constructicons left Cybertron in a starship for unknown reasons. Omega Supreme pursued them, "for millions of years, across the galaxies", until they finally arrived on Earth and were reunited with Megatron. He got his chance at revenge when the Constructicons started mining an asteroid that turned out to be the egg of an organic creature. Omega left the creature to its own devices, which would have resulted in it devouring San Francisco. However, Optimus Prime convinced Omega to lead the creature back to its asteroid, which would sustain it. Omega lost his chance at revenge, but he did his duty.
In 1985, the Autobots used Omega Supreme to follow the Decepticons back to Cybertron when they intended to use Vector Sigma to create a new group of Decepticon warriors. After failing to stop the Decepticons from creating the Stunticons, the Autobots created a new team of their own to counter the new threat, the Aerialbots. As Omega Supreme escaped Cybertron, he was hit by weapons fire from the Centurion droids, and once he safely disembarked his passengers on Earth, he catastrophically exploded.
Ratchet, Wheeljack and Sparkplug Witwicky connected Omega Supreme's mind to the Ark's life support unit while they set about putting the giant back together. The arrogant Aerialbots, unimpressed with both the Autobots and the humans they protected, refused to help their comrades in defeating the Decepticons until their group leader Silverbolt showed them how Sparkplug was able to disregard his fatigue and continue repairing Omega Supreme simply because of his concern for a friend's well being. Soon afterwards, the Aerialbots were facing defeat as Superion at the hands of the Stunticon combined form, Menasor, when the newly-repaired Omega Supreme suddenly appeared and helped them defeat the combiner and send the Decepticons packing. In season 3 his role as space transport was fulfilled by Sky Lynx. He was last seen in season 3 transporting Autobots to Junkion to investigate the strange behaviour of the Junkions. He got shot down by Cyclonus, Scourge and the Sweeps crashing the Autobots on an asteroid. After being repaired Omega quickly turned the tide of the battle. On arriving on Junkion Omega again battled the Decepticons. He was knocked down by a blast from Galvatron's cannon mode but recovered and battled the Decepticons until Blaster asked him to bring him to altitude to counter the Quintesson signals. . Omega rarely spoke, and then it was usually just two or three words. This is by choice, however, as he can speak normally if prompted.
Omega Supreme was built by the Autobots on Earth in order to guard the Ark while they were away. With Omega completed, the Autobots could leave the base en masse to attack the Decepticons. Megatron immediately took advantage of the situaiton by ordering Skywarp, Starscream, Thundercracker, Frenzy, Rumble, Buzzsaw, and Laserbeak to attack the Ark. Unfortunately, they didn't get the memo about the Autobots' new defense system, and Omega Supreme easily took out all of them except Laserbeak, who managed to escape with a wounded Megatron back to the Decepticons.
Early on in the first Galvatron encounter, the Autobots openly talked about siccing Omega Supreme on the Decepticons. And then never did so, despite it being a smart idea and knowing it was an option.
Though Omega Supreme continued to guard the Ark, he didn't seem to stay quite as huge as he used to be. He could soon fit into the Ark. When Trypticon attacked, he carpeted the entrance to the Ark with sonic scrambler mines, disabling Omega and the other Autobots within; Omega was thus unable to square off against the giant. Later, Omega Supreme acted as a sort of Master of Ceremonies when Blaster and Grimlock were due to fight it out for Autobot leadership on the moon. He was pretty small.
During the Underbase crisis, the narrator seemed to think it was bad news when Buzzsaw cannon-blasted Omega Supreme - and Omega actually seemed to be getting knocked over. He didn't live long enough to be embarrassed, as shortly after the Underbase-powered Starscream killed him. Pieces of him were seen in Ratchet's repair bay, but he was never shown to be functional again.
Some time after the departure of the Ark, Omega Supreme and Jetfire were sent out to go find them. They ultimately ended up buried under Antarctica on Earth. Millions of years later, Jetfire remotely reactivated Omega Supreme in an attempt to defeat Sunstorm. Though Omega Supreme was initially successful, Sunstorm managed to obscure his vision. When Omega Supreme retracted his visor in order to see, Sunstorm blasted him right in the face with a burst of solar radiation, instantly knocking him off line. He soon recovered, but Sunstorm had escaped. Omega later helped the Autobots in building Autobot City.
Omega Supreme is largely a non-participant in the war between the Autobots and Decepticons. Predating the notion of factions and having survived two Primes, he remains in seclusion in a specially-shielded artificial asteroid within the Muta-Gaath Nebula. Though nominally allied with the Autobots, he remains outside of the conflict for fear of escalating it due to the firepower he commands. Instead, he exists as a resource to Primes in times of doubt. However, he did participate in the Autobot/Decepticon battle to stop Thunderwing, alongside Optimus Prime, Megatron, and Trypticon.
Omega Supreme is one of the few living Transformers to remember the first Ark. Believing that the Transformer race should exercise a slow inner growth through intellectual contemplation, he frequently clashed with the expansionist Nova Prime, who felt Cybertron's destiny lay in the conquest of other worlds. After the Ark's departure and Nova Prime's disappearance, Omega Supreme discovered a horrific creation of theirs: Monstructor. He sealed the gestalt in a dimensionally-displaced prison to prevent it from devastating Cybertron and escalating the burgeoning conflict. Centuries later, Optimus Prime came to him for advice. While the two were talking, Monstructor — somehow freed from captivity — attacked. Omega Supreme told Optimus Prime the truth about himself, Nova Prime, and Monstructor. Though Optimus Prime succeeded in defeating the gestalt, he condemned Omega Supreme for attempting to play god by simply locking them away.
As he was defeated very easily by a single gestalt, this version of Omega is either considerably weaker than others, or the gestalts are considerably stronger in this continuity (Omega seems to believe the latter).
Along with the other Autobot outposts, Omega Supreme's hidden base was attacked by a Decepticon Army, but "I AM OMEGA SUPREME." Enough said. He recieved the distress call of Hot Rod when the Trion crashed, and a mysteriously larger Omega Supreme than had been previously seen (He probably felt so embarrassed getting beaten by Monstructor that he installed a home asteroid gym) arrived in the nick of time to drive off the Swarm. Who needs RAID when you can have OMEGA SUPREME? Omega ferried the Autobot team to Earth in time to face the divided Decepticon forces. Omega Supreme dropped into the fight, carrying the Devestator away from the city. Their fight continued on Ellis Island with Devestator decrying that he could not be defeated. However, "I AM OMEGA SUPREME!" Enough said.