Where the Decepticon cassette with a cat-mode is a master of moving about undetected, it is fitting that his Autobot counterpart is one of the best at tracking down robots who don't want to be found. Steeljaw is a tenacious tracker of unmatched skill, whose olfactory sensors in his tiny nose can track even the faintest scent for a range of 800 miles. All business when on the job, he can come off as cold, even rude to others except the Witwickys, but that's just his professionalism and determination getting the better of him. Off the clock, he loves to investigate odors of all shapes and sizes, and Earth has many new and unusual smells for him to enjoy - the perfume of young women being one of his favorites. Steeljaw has a nearly unbreakable bite, from which he takes his name, and is armed with two solar-powered pellet guns. He can electromagnetize himself to stick to surfaces in cassette mode. His only real weakness is a tendency to rust.
|“||My man Steeljaw can sniff out any trail, if it's hot or if it's not.||”|
In an alternate timeline of the year 2008, Steeljaw was stationed at Autobot City: Earth when it was sacked by Quintessons. He survived, hidden within Blaster's tape compartment, and was activated by Hot Rod and Arcee to help them fight off the invaders.
In the normal timeline (albeit in a G.I. Joe comic), Steeljaw was part of a team sent by Optimus Prime to stop a Cobra-rebuilt Megatron. Steeljaw was killed rather abruptly, being the first victim of Megatron's new "hyper-velocity" rail gun.
Voice actors: ? (US), Masashi Ebara (Japan)
Megatron sent Ratbat to find the secret location of Metroplex's construction site. Blaster ejected his own cassette troops, Steeljaw among them, to counter the Decepticon threat. His cassette army failed, allowing Ratbat to slip through and discover the location of Metroplex.
In 2005, during Megatron's attack on Autobot City, Soundwave ejected several of his cassette warriors to prevent Blaster from sending a radio transmission to Optimus Prime on Moonbase One. To fend off Soundwave's cassettes, Blaster ejected his own force, including Steeljaw. Blaster's cassettes and Soundwave's cassettes appeared to be evenly matched, and Steeljaw had no small bit of fun gnawing on Rumble.
In the year 2006, Steeljaw was summoned by Rodimus Prime to help track down Daniel Witwicky, after he vanished from a dignitary's party on Cybertron. Steeljaw tracked the boy and Grimlock to an old abandoned corridor and a hidden chamber, where the Quintessons had once exiled their unwanteds into other dimensions. Along with Ultra Magnus, Blaster and the other cassettes, Steeljaw followed the trail into Menonia. He ultimately found Daniel trying to free a great sorcerer known as the Golden One from a tomb. With Ramhorn's help, they broke open the mouth of the cave, and the Golden One helped the Autobots defeat the Quintesson exile who had enslaved the locals.
After Blaster was killed in a duel with Soundwave, Steeljaw, his cassette partners, Wheelie and Daniel Witwicky pleaded with Rodimus Prime to rebuild their friend. Rodimus eventually caved and rebuilt Blaster as Twincast.
It was also apparently Steeljaw, who became her companion in her next adventure, when she visited the Generation 2 timeline and encountered the Jetfire of that era. Steeljaw commented that the Autobot smelled "like a warrior I know" and asked if he was the same person in a new body.
Steeljaw accompanied and protected Teletraan 15 on her journey as she filled his recording space with data on the Transformers whom she had been sent to study. The observing Teletraan 10, on the other hand, was more than perturbed by Steeljaw's fondness for the smell of young women, and threatened to reveal publicly his tendency to rust. When the pair returned to the artificial satellite Nana, Teletraan 15 was suddenly possessed by the disembodied spirit of Starscream... and Steeljaw was not seen in her company again.
Steeljaw was depicted among Blaster and the cassettes as part of the resistance movement organized against Shockwave on Cybertron by Hot Rod and Kup. He participated in the final conflict against the Decepticons and the Guardian Robots, bringing the planet back under Autobot control.