The process only barely succeeded, Megatron was deranged and animalistic, and was ultimately defeated by Optimus Prime and Grimlock.

Grimlock was one of the favorite Autobots of IGN.

According to X-Entertainment Grimlock was the 2nd top Transformers figure of all time.

After proving his worth by defeating the Decepticon Trypticon, Grimlock was elected leader of the Autobots.

Under Grimlock ’ s leadership, the Ark was repaired and made space-worthy again.

Grimlock and the Dinobots were destroyed during the battle against Starscream while the villain was super-powered by the Underbase.

Grimlock was seen among the Autobots being repaired on the Ark when Optimus Prime sent Landmine and Cloudburst on their mission to obtain computer chips to repair fellow Autobots in issue # 52, " Guess Who The Mechannibals Are Having For Dinner?

After a short time, Grimlock ( along with Jazz and Bumblebee ) was rebuilt by Ratchet as a Pretender.

Grimlock was unwilling to subject his Dinobots to anything he would not go through himself, and thus decided to test the fuel on himself first.

Their arrival, and their reviving the fallen Autobots with Nucleon, was an important part of Transformer victory that day, but Optimus Prime once again lost his life, sacrificing himself to destroy Unicron, and once again naming Grimlock as his successor with his dying breath.

Realizing that Grimlock had become trapped in a " chrysalis " stage, Prime's Powermaster partner, Hi-Q, tapped into and accelerated the process, completing Grimlock's evolution into a more powerful " Actionmaster " – but the enhanced power came with a price: Grimlock was now no longer able to transform into dinosaur mode.

Grimlock was one of the few survivors, and when Optimus Prime returned, recreated by the Last Autobot, Grimlock participated in the rout of the Decepticons.

The author of these stories, Simon Furman, was particularly fond of Grimlock, often using him for his original stories, and even using the character for responses on the readers ' letters page.

When leader of the Autobots, Grimlock was involved in assisting Action Force battle Megatron in London and attempted to kill the Predacon Divebomb in order to silence embarrassing facts about Swoop's past.

Tired of Prime's pacifistic approach to protecting Earth, Grimlock was joined by several older Autobots like Prowl and Wheeljack, who had just recently been reactivated, and longed for the older, simpler days.

With his transformation capabilities restored ( the explanation for which was not offered in the American series ), Grimlock was Optimus Prime's second in command in the so called Generation 2 series, aiding in the Autobots ' war against the " second generation " of Cybertronians led by Jhiaxus.

Unfortunately, their design specs proved to be a little too accurate to the creatures they were modeled on, as their primitive brains went out of control, and Grimlock almost destroyed Teletraan I, before the trio was stopped.

When Soundwave read his mind and learned of this animosity, Megatron was able to trick Grimlock and the Dinobots into switching sides, attacking and capturing Optimus Prime.

Ultimately, it was when Optimus Prime threw himself into harm's way to save Grimlock from an explosion that he accepted his mistake and rejoined the Autobots.

After the nominees were narrowed down to the top five, Dinobot beat Soundwave, Grimlock, Jazz and Shockwave with 31, 000 votes.

In 2007, USA Today polled people as to which Transformer they want to appear in the next Transformers film ; Grimlock came in tied for second with Devastator.

In the Dreamwave More Than Meets the Eye guidebook series, the term Transmetal was expanded to include any Transformer with a metallic animal-themed alternate mode-for example the Dinobot leader Grimlock turned into a Transmetal Tyrannosaurus.

Grimlock appears in the TFcon 2008 voice play prelude comic called " Ground Effects " where he helps the Dinobots to dig up a Transformer on Dinobot Island.

Swoop appears in the TFcon 2008 voice play prelude comic called " Ground Effects " where Grimlock orders the other Dinobots to dig up a Transformer on Dinobot Island.

Snarl appears in the TFcon 2008 voice play prelude comic called " Ground Effects " where Grimlock orders the other Dinobots to dig up a Transformer on Dinobot Island.

Sludge appears in the TFcon 2008 voice play prelude comic called " Ground Effects " where Grimlock orders the other Dinobots to dig up a Transformer on Dinobot Island.

Grimlock can be cold, merciless and contemptuous of those he considers beneath him, such as human beings, and at times, even Autobot leader Optimus Prime himself, who Grimlock would gladly supplant as Autobot leader if he were able to, giving him a superiority complex as indicated by his Generation 1 tech specs.

Grimlock developed into a tyrannical ruler who led the Autobots with an iron fist.

This proved to be the last straw for the Autobots under Grimlock's command, who collectively conspired to overthrow him, arranging for Blaster to challenge Grimlock for leadership.

Grimlock and the Dinobots were the only ones among the Autobots who saw through the Decepticons ' false pretense of peaceful co-existence and suspected the plan of mass betrayal.

In the story Crossing Over by Fun Publications Grimlock was among Autobot troops of Optimus Prime who responded to the sighting of Megatron and arrived in time to save the dimensional traveling Autobot Skyfall from Megatron's wraith.

She was among the small group who traveled to the sorcerous other-dimensional realm of Menonina to track down Daniel and Grimlock, who had vanished there.

He is subsequently attacked by both the Combaticons and the Protectobots, who had been sent by Grimlock to arrest him.

Jazz appears in the 2008 April Fool's comic Shattered Expectations by Fun Publications where he, Goldbug and Grimlock attempt a raid, but are confronted by Starscream and Razorclaw, who in turn call in the ' Mayhem Suppression Squad '.

Two Dinobot figures were released as part of the " Transformers: Energon " toy line: Grimlock and Swoop, who can merge to form the giant robot Mega-Dinobot.

In " Human Error " ( part 2 ), Grimlock and Swoop appear when a teenaged Sari asks for their help to rescue the Autobots from Soundwave, who wants to reprogram them into serving him.

Attacking a meeting between Jetfire and Shockwave, hypnotizing the former and incapacitating the latter, they were then beaten by Grimlock, who arrived because he believed that Jetfire was betraying them.

He sided with the " rebel " Autobots Blaster and Bumblebee who Grimlock, leader of the Autobots at the time, thought were criminals.

Jetfire was among the Transformers kidnapped by the ancient Cybertronian called the Fallen, who planned to use the genetic potential in his spark to awaken Primus, but he was freed by Grimlock, putting the grudge to rest.

Grimlock attempted to use the children as blackmail against Blaster, who was defecting from the Autobots.

However he came to suffer it, deactivation was Prowl's fate for the extended future, until, in 1990, the Dinobot commander Grimlock pumped the Ark's stasis pods full of the life-restoring fuel, Nucleon, reactivating Prowl, who participated in the epic battle with Unicron, and immediately fell into the trusted role of second-in-command again, only this time, his commanding officer was Grimlock himself, having been appointed leader by the dying Optimus Prime.

Swoop is the only Dinobot who can fly in his dinosaur mode ( although Grimlock was once depicted flying in dinosaur mode in season three of the television series, assumed animation error ).

Ratchet succeeds in this task, but while Megatron leaves him unattended to observe Starscream's attack on Earth, he is able to use other prototype Pretender shells to restore to life Grimlock, Jazz, and Goldbug, who he restores to being Bumblebee out of personal preference.

Bumblebee, Jazz, and Grimlock follow a lead to VsQz, third moon of the planet Cameron, where they run afoul of both a monstrous creature created by the corrupted Matrix energy, and the mighty Decepticon Pretender, Thunderwing, who defeats them and claimed the Matrix for his own.

Charged with hunting down the petty criminal known as the Mechanic, who had stolen some Autobot equipment, Goldbug and Blaster opt instead to remove themselves from the tyrannical command of then-leader Grimlock.

Ratchet succeeds in this task, but while Megatron leaves him unattended to observe Starscream's attack on Earth, he is able to use other prototype Pretender shells to restore to life Grimlock, Jazz, and Goldbug, who he restores to being Bumblebee out of personal preference.