Grimlock (Earth-1984)

Grimlock is an Autobot who leads a group known as the Dinobots. He was experimented on by the Decepticon scientist Shockwave and was given a prehistoric beast mode.

Early Life
Grimlock was a ruthless gladiator from Kaon. He soon joined the Autobots after the Decepticons ignitiated the civil war that would cost the lives of millions and ultimately Cybertron itself.

His ability to withstand his opponents and survive a battle earned him to lead a team of Autobots called the Lightning Strike Coalition, a subgroup who reluctantly followed the Autobot leader's more cautious brand of warfare when ordered. Grimlock bonded well with other members Slug, Swoop, Snarl, and Sludge. He believed that caution would hinder the Autobots' attempts at quick victory.

The Sea of Rust
During one of the Lightning Strike Coalition's missions, Optimus ordered Grimlock and the others to abandon their mission, lest they waste any energon. Grimlock reluctantly agreed, but the team found out that Swoop was captured. Grimlock decided to ignore Optimus' orders and the team went to find Swoop. They travel to Swoop's last kown location at the Sea of Rust, where they fought through a horde of bug-like transformers called Insecticons, and they finally reached the mastermind behind Swoop's capture, Shockwave, who lured them into a trap and took them as prisoners for his experiments. The team was overwhelmed by the Insecticons, but Grimlock struggled free to engage Shockwave, but was swiftly helled by the Insecticons' attack.

Becomming a Dinobot
Awakening in Shockwave's laboratory, Grimlock found his entire body painfully disassembled by the scientist's machines, in the service of a twisted experiment to create the perfect soldier with incredible physical power and limited intellect. He and his teammates were reconstructed into new, more powerful forms based on carbon-based prehistoric creatures from a different planet that Sockwave glimpsed from a space bridge he had discovered. With his mind fragmented, he struggled against Shockwave's mental conditioning, refusing to succumb to his control.