Scrapper is the engineer of the Constructicons. While the other Constructicons put their masterpieces together, Scrapper is the one who designs everything for them. His designs are among the best in Transformer history, however, Scrapper is a modest Decepticon who quickly shrugs off the praise he receives. In that respect he is the polar-opposite of his frequent second in command, Hook, who is an egomaniacal glory-hound.
Though modest, Scrapper is still a total nutcase. One of his favorite artistic liberties with his designs involves taking living Autobots and using them as raw materials. This vicious act is something Megatron finds admirable, as he considers Scrapper the most valuable of the Constructicons.
Scrapper, who was evil, helped build Megatron.
Later, Megatron used the Robo-Smasher to make Scrapper, who was good, evil.
Finally, Megatron built Scrapper.
It all makes sense.
Scrapper's nasty side is shown when he uses the remains of damaged Autobots to make a throne — nasty!
Scrapper and the Constructicons, after troubleshooting their union as Devastator, were sent by Shockwave to abduct Buster Witwicky. Their attack was called off to regroup when Soundwave discovered Buster held the rest of the Creation Matrix in his head.
After Megatron's retaking of Decepticon command, Scrapper and the other Constructicons were charged with building perimeter defences around their headquarters located at the base of a coal strip mine in eastern Wyoming. Devastator's services were again required when the Autobots staged a surprise attack, but they retreated once they had what they needed.
During Ratbat's command, an attack was ordered on the combined Autobot forces on Earth's moon while Blaster and Grimlock dueled for leadership. Under cover of battle, Scrapper and the other Constructicons retrieved the remains of several fallen and captured Decepticons.
Scrapper worked for Megatron during the Earthforce saga, as did most of his fellow Constructicons. He was first seen telling stories to Mixmaster in the hallway while Soundwave was mentally searching for traitors — and blackmail information. He later joined the united Decepticons in an ill-fated strike against Autobot Earthbase.
In 2008, Scrapper was briefly seen with a Decepticon strike team on-board Astrotrain, just before they were attacked from out of nowhere by the Quintessons. He didn't say much, but that's probably because he was still pissed that, in the future, the Constructicons think Mixmaster is a better leader than him. He thinks that's crazy. Get it? Get it?
In the fifteen years since the battle on Klo, Megatron was resurrected and had reclaimed portions of his previous army, including Scrapper and the other Constructicons. When the Decepticon Landquake mysteriously appeared and claimed to be from another timeline, his body was scrutinized by Soundwave and Scrapper. Scrapper's research led him to believe Landquake was telling the truth, noting that study of Unicron pointed towards the existence of parallel worlds and that Landquake's makeup was unlike any Transformer construction he was familiar with.
Furthermore, he announced to Megatron that an anomaly in South America radiated identical wavelengths as Landquake, something that might merit further inspection. Scrapper's only mistake was suggesting the hypothetical help of Shockwave would be appreciated, resulting in violence upon his person from Megatron. Regardless, Megatron agreed that the anomaly demanded his attention, and while Scrapper was instructed to pry deeper into Landquake's energon readings, the Decepticon commander accompanied the rest of his troops to South America.
Nine million years ago, a young Megatron staged a Decepticon uprising and sieged Iacon to smokescreen his true designs. Long-buried planetary engines from Cybertron's similarly buried past were to be refitted by Scrapper and his Constructicons in order to convert their planet into a galaxy-faring war world. While Megatron had gone briefly missing during battle, Scrapper was ordered by Starscream to accelerate the process, despite the Constructicon's misgivings. Their hasty actions could tear the planet apart! In the end, Starscream gave Scrapper a choice: mechaform Iacon, or get mechaformed by Motormaster. As Scrapper predicted, the region went under a major upheavel, and he and the other Transformers in the area were forced to abandon their work as everything exploded.
The war entered a dark age when both Optimus Prime and Megatron were presumed lost forever in a space bridge accident. During this time, the technology of combining (and thus Devastator himself) was invented, but Devastator and other super robots were declared non-allied by the Crisis Intervention Accord to stave off an arms race that would escalate the war to frightening levels. Despite this, Ratbat's Ultracons secretly enlisted Scrapper and his Constructicons.
Millions of years later, after a subset of the Transformers war awoke on Earth in 1984, the Constructicons somehow found their way from Cybertron to Earth. They were defeated along with the other Decepticons in 1999, and subsequently buried for years in a shuttle explosion. When they awoke in 2002, the Constructicons combined into Devastator and rampaged San Francisco. Optimus Prime shot them in the head.
The ruthless terrorist organization known as Cobra dug dozens of Autobots and Decepticons out of their four-million-year resting place and began rebuilding them into a Cobra-controlled army. However, with Wheeljack and Bumblebee's help, the mind-controlled Transformers were awakened, and the very cheesed-off Constructicons, including Scrapper, descended upon their previous captor, Dr. Mindbender.
Their surroundings were soon under attack by Autobot and G.I. Joe forces, requiring Scrapper and the other Constructicons to combine into Devastator. Ultimately, Devastator was brutally defeated after the Decepticon fatally wounded Hound, sending the fallen Autobot's friends into a berserker rage.
Scrapper and his team of Constructicons were apparently put out of work due to the labor shortages masterminded by Ratbat. Rather than sitting idly by and collecting roboto-unemployment checks, the Constructicons became involved with the illegal fighting ring operating in Kaon, dedicating their talents to quickly creating a combat arena at each new site of the tournaments, modifying scrap on hand for their needs. Scrapper witnessed firsthand the level of brutality Megatron could reach outside the ring when he executed the Autobot surveyers, Fastback and Bumper.
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Spoiler warning: Plot and/or ending details for All Hail Megatron issue 1 follow.
A year after Megatron arrived on Earth, the Constructicons arrived as well. When they transformed before human observers in New York City, Scrapper told the humans that they were aliens from another world (true), who had come to spread a message of peace and unity (not so true). A confused Hook looked at Scrapper, then they shared a laugh and proceeded to kill things.