As king of the Dinobots, Grimlock believes that the best approach to a problem is to smash it first, worry about the specifics later. One of the most powerful warriors in the universe, he likes nothing more than showing off his strength, leaving his enemies stomped, chomped, or turned to ash by a blast of his fire breath. This rather rough n' tough attitude extends to his Autobot companions, who are expected to meet Grimlock's standard of strength. That said, the Autobots have a lot less to fear from this behemoth than the Decepticons.
History[]
Grimlock was a prisoner aboard Lockdown's ship until the Autobots detached that section and flew it to China, though Optimus did not inform his troops of their presence. When Galvatron's new Decepticons shot down their ship, Optimus went to recruit the Dinobots for their aid. Optimus was nevertheless amazed that the "legend" existed, and freed Grimlock and his men. Optimus explained to Grimlock that the Creators intended to wipe them all out, and urged them to stand with him, or refuse and die. Grimlock immediately challenged Optimus, but despite his immense size and strength, was bested in combat. Grimlock submitted to Optimus's lead, and allowed the Autobot leader to mount him. Grimlock and Optimus led the Dinobot-Autobot charge into Hong Kong, where Grimlock killed many Decepticons with ease.
Grimlock later helped escort the Seed to a safe location, but Lockdown arrived and turned his tractor beam on them. Grimlock and the Dinobots would have been captured once again had Optimus not destroyed the tractor projector with a well-placed shot. Optimus ordered Grimlock and the others to flee while he fought Lockdown. The group subsequently held the line on a nearby bridge until Optimus, Bumblebee, and their human allies triumphed and killed Lockdown. Optimus granted Grimlock and the Dinobots their freedom, and Grimlock happily departed with his team for parts unknown.
In the years following the battle in China, Grimlock joined the Autobots in hiding at Cade Yeager's scrapyard. Unfortunately, he developed a habit of stealing the local sheriff's cruiser and using it as a chew toy. On the day Cade encountered a dying Cybertronian knight, he returned to find an angry sheriff demanding the return of his vehicle. Grimlock tried to hide the cruiser by eating it but was eventually berated into vomiting it back up. Cade then turned on his assistant Jimmy for not keeping Grimlock under control, who pointed out that without Cade the Autobots were uncontrollable and Grimlock had tried to eat him at least once. Grimlock later relaxed in the scrapyard while Cade called his daughter Tessa.
The next day, their refuge was discovered by the Decepticons and the T.R.F. forces. As their enemies prepared to invade, Cade and the Autobots escaped to a nearby town to carry out their emergency plan. Grimlock joined Slug in laying a trap for the pursuing TRF forces, bursting from beneath the road leading to the town and destroying the convoy. Grimlock then made his way to the town in time to save Cade and Izzy from Barricade, swatting the Decepticon with his tail, before slamming Megatron himself into the ground. As Dreadbot ran in to assist, Grimlock snapped him up and killed the Decepticon bank robber. He then turned his attention back to Megatron and Nitro Zeus, who quickly fled once Grimlock unleashed his considerable might upon the Decepticons. Grimlock remained in America after Cade was taken to England by Cogman and did not participate in the final battle on Cybertron.