Megatron Prime

Preparing for the return
Trapped in another dimension, Megatronus eventually found a way to escape: he caused the prison ship Alchemor, containing numerous Decepticons, to crash on Earth. Sometime after the criminals' escape, Megatronus contacted Steeljaw, the leader of a small gang, and tried to persuade him to build a space bridge to the alternate dimension so the Fallen could escape. However, neither persuasion nor threats had any effect on the cunning Decepticon. Megatronus finally offered to grant Steeljaw and his subordinates an oath of allegiance, and upon his return, he would grant them Earth, which they could transform into a Decepticon homeland. Steeljaw agreed.[3]

As he gathered the components needed to construct the space bridge, Megatronus continually hurried and intimidated the Decepticons, remaining visible only to Steeljaw. Finally, when the mechanism was complete, Steeljaw activated it, returning Megatronus to his home dimension.[4]

Battle with the Autobots
As it turned out, Megatronus had been leading Steeljaw on all along: he had no intention of handing over Earth to the wolf-like Decepticon, but rather of destroying it, just like Cybertron. To do this, he wanted to fuse Primus's Spark and Unicron's Anti-Spark using the spear Steeljaw had procured for him. To prevent the unification, Bumblebee's team and Optimus, returned from the Primes' dimension, engaged Megatronus in battle. It was to no avail: even with the help of Steeljaw, who was extremely furious at the Fallen One for deceiving him, Megatronus managed to scatter his opponents and begin his plan. However, Megatronus was unable to complete his task: Optimus Prime severed his spear, thereby forcing the Sparks of both gods back into place. Ultimately, uniting all three "Decepticon hunters," Strongarm, Sideswipe, and Bumblebee banished the villain to the dimension from which he came. His subsequent fate is unknown.

Biography
Background
In the distant past, Megatronus was one of the Thirteen Primes created by Primus to combat Unicron.[1]

Exile
One day, Megatronus Prime demanded that Solus Prime create a weapon superior to all others—the Requiem Blaster. Despite the blacksmith's resistance, Megatronus convinced most of the Primes of the necessity of this action, and the weapon was created. However, Megatronus then betrayed the other Primes and killed Solus Prime. As punishment for his actions, Megatronus was banished from the universe and exiled to an alternate dimension for imprisonment, though he was still able to communicate with certain beings residing in the prime dimension. Enraged and humiliated, Megatronus blamed Earth and Cybertron, promising to eventually find a way to return to the real world and destroy both planets. The Fallen, maintaining only a tenuous influence within the universe, became known in his own right as the first Decepticon. Many cycles later, a Kaonian gladiator codenamed "D-16", while studying the history of Cybertron, became inspired by Megatronus and subsequently named himself after him, believing that he was the only implacable Prime who had forged his own destiny.[2]

Personality and character traits
Although Megatronus resembled his brother Primus in appearance, his personality was the complete opposite: in addition to an insatiable thirst for battle, Megatronus was ambitious, ruthless, and proud. Infinitely devoted to the ideals entrusted to him by his creator, Primus, he nonetheless resembled Unicron more closely, and he felt that the other Primes viewed him with caution and hostility because of this; they even avoided looking into his blazing eyes. This distressed Megatronus to no end—he felt like an outcast and a scoundrel, and considered the qualities he possessed a curse from above, sent so that his brothers would not have to bear even a fraction of the burden of darkness. In many ways, Megatronus's fanaticism toward Primus was intended to mask his own fears. He was inconsistent in his decisions and often guided by his paranoid thoughts, ignoring even those closest to him—Solus, Lij, Micronus, and Onyx. After all the terrible deeds he had committed, Megatronus considered himself unworthy of his own name and, calling himself the Fallen, set out on a cosmic journey to try to atone for his sins and cultivate the seeds of light that Solus had discerned in him—helping living beings on other planets cope with adversity and hardship.[1]

As it turned out, all this was in vain, and Megatronus not only returned to his original form, but also became so insane that he intended to merge Primus's Spark and Unicron's Anti-Spark into one, thereby destroying Cybertron and Earth respectively. Fortunately, Bumblebee and Optimus Prime stood in his way, managing to expel Megatronus from our world.[5]

Its body is composed of dark gray armor plates with purple highlights and neon turquoise accents. A horned mask and glowing red optics are visible on its head, and its hands end in sharp claws. Its shoulders are broad and rectangular, and its legs are massive, with large, boot-like mounts.

Physical data
Floor
Male
Body color
Purple, black, gray
Color of eyepieces
Red
Height
9.8 m.
Alt form
Tank
Megatronus transforms into a Cybertronian tank, armed with a powerful long-range plasma cannon and multiple heat-seeking missiles. In his alt form, he's quite slow and clumsy, but in robot mode, he's capable of decent speed and possesses remarkable agility. He wields two thermonuclear blasters, which can fire a barrage of fire or switch to a continuous laser beam. In close combat, he prefers to use his voulge and two drills, which his hands can transform into.
Among other things, he possesses telekinesis and can move objects and even other Transformers remotely. He's quite strong: he was able to lift Grimlock with one hand and throw him aside without using his superpowers.
Alt form: Cybertronian tank;
Weapons: two drills, thermonuclear blasters, two rocket launchers, vulge, plasma cannon, Requiem Blaster (temporary);
Features: has telekinesis: can lift into the air and throw any enemy with the power of thought.