[1] Grimlock’s character is merciless and contemptuous of those he considers beneath him, such as human beings and, at times his fellow Autobots .

The character's initial sense of superiority was changed by the relationships he formed with others as he got to know them on a personal level and started to see them as equals.

Grimlock is among some of the strongest of the Generation 1 transformers, possibly equal to or even superior to Optimus Prime and Megatron in most continuities.

The original character profiles written by Bob Budiansky and Dan Bobro indicate that Grimlock and the Dinobots were intended to come from Cybertron to Earth like most of the other Transformers.

Grimlock was featured in the 1985 Find Your Fate Junior book called Dinobots Strike Back by Casey Todd.

Within Grimlock, Armada Megatron and Universe Optimus Primal are each transported to the Unicron world, where they eventually team up and fight Striker and Reptilion.

After the events of the Botcon 2003 voice actor play, Optimus Primal is able to use his spark telepathy to free Striker from Unicron's influence.

Optimus Primal, Megatron, and Grimlock help break free the slaves from various timelines that are held there and gets them to Cybertron (Transformers: Universe #2).

from Transformers Comic-Magazine issue #12 by German comic publisher Condor Verlag, Optimus Prime instructs Backstreet, Bumblebee and Ruckus on how to identify Autobots from Decepticons in battle using the Ark's computer.

Through Transformers: The War Within, the company shaped a background on Cybertron for Grimlock, which showed that he had participated in the planet's underground gladiatorial game in order to unleash the rage and anger he had always overflowed with.

Dreamwave's closure meant that they would tell no further stories of their Grimlock, although his "War Within"-era design did appear in the Transformers: Universe comic book exclusive to BotCon.

[7][8] Grimlock was also featured in the Beast Wars: Uprising storyline as a member of the Maximal-Predacon resistance movement instigated by Lio Convoy.

In the beginning of Beast Wars, The Ascending Razorbeast speaks to Prowl and Wolfang about how he feels there is no rescue mission coming for them from Cybertron as Grimlock hunts in the nearby woods.

[10] Grimlock also features briefly in the comic story "Dawn of the Predacus," in which his exposure to transmatter turns him into a protoform, heralding his eventual role in Beast Wars fiction.

"[13] The Classic line appeared in a simple Flash-based video game on the Hasbro web site called Transformers Battle Circuit.

Robots in Disguise Grimlock (in Walmart yellow repaint colors) appeared in the 2004 BotCon voice actor play.

It comes as no surprise that longtime Grimlock fan Simon Furman intended to feature the characters in Dreamwave's Energon comic book, but the company's closure prevented this.

He also served as captain of the Iron Hope which was crewed by Bonecrusher, Grimlock, Ironhide, Knock Out, Overcast, Prowl, Quickstrike, RipTide, Skyblast, Smokescreen, Swoop, Wreckage, and the Sky Scorcher Mini-Con Team.

Producer Tom DeSanto has stated that he had an idea on how to include the Dinobots and Constructicons in a possible sequel,[16] although director Michael Bay has confirmed that they will not be.

The Sector 7 viral marketing web site featured several videos recording supposed evidence of Transformers on Earth.

These featured cameos by Generation 1 Transformers, including scenes of Grimlock destroying a construction site, as well as scenes of Kickback and Laserbeak being video taped by people accidentally, and a security video showing bits of a robot looking a lot like Generation 1 Bumblebee transforming in a parking garage.

The mad autobot scientist Wheeljack duplicates Grimlock's design to create an army of dinobots, which he uses to attack the Decepticons.

In Reunification Grimlock is seen gnawing on the body of Blurr, who was punished by Optimus Prime for failing to stop Rodimus from taking the Ark.

[24] The second Grimlock is part of Bumblebee's new team of Autobots in Transformers: Robots in Disguise, and is a more lighthearted version of the character with a love of smashing but a fear of kittens.

In Transformers: Robots in Disguise, as one of many Decepticon prisoners aboard the Autobot ship Alchemor, Grimlock was the only one not to escape when the vessel crashed on Earth.

In Transformers: Power of the Primes and (2018 video Game) Earth Wars, the Dinobots get to combine into Volcanicus for the first and only time to fight against Predacons' Predaking.

Able to channel his fury into a "rage mode" that makes him an unstoppable engine of destruction, he becomes a potential threat to even his closest allies when his optics go from blue to red.

While he's usually able to control his anger, prolonged time in his dinosaur mode can disrupt his system, and the traumas he's suffered carry triggers, meaning those around him have to be careful not to set him off.