Death's Head is a "freelance peacekeeping agent." (He doesn't like being called a "bounty hunter.") He likes to end his statements as a question, yes?
Marvel Comics UK continuity
(Note: A lot of Death's Head history was written after he was effectively taken out of the Transformers UK universe and was formally part of the Marvel Universe. The problem is, a lot of the history has to be common to the Transformers Universe as well for Death's Head's story to work.)
Death's Head was created on Styrakos using a combination of magic and technology. His creator, Lupex, originally intended for the robot body to serve as his own, since Lupex was burning through the organic bodies he inhabited at an increasing rate.
Lupex's vengeful student, Pyra, plotted to use the robot to kill her former master. Pyra gave Death's Head his initial programming, and sent him to kill Lupex. The plan apparently succeeded, and Death's Head - now operational on his own - apparently killed Lupex. Before Pyra could make further use of the robot, however, it was secretly stolen by the Time Lord known as the Doctor. The Doctor activated Death's Head, enlarged him, and set him loose in the Transformers (UK) Universe.
Eventually Death's Head found his way to Elpasos where he saw a bounty on the head of Galvatron for 10,000 Shanix. Death's head confronted Cyclonus and Scourge (blasting the latter) and learned that Galvatron had travelled to Earth's past and followed him to 1987.
Death's Head arrived on Earth in the year 1987, time-displacing the Protectobot First Aid and apparently destroying the Autobot Bumblebee. After a prolonged battle with Death's Head, Galvatron, Ultra Magnus, and Rodimus Prime, Wreck-Gar sent all the time-displaced combatants back to their home time of 2007 - except for Galvatron.
Some months later, Death's Head accepted a bounty on Rodimus Prime, and tracked him down on Cybertron. Unfortunately, Death's Head was confronted by all the Autobots in Autobase, and was forced to cancel the contract. Instead, Rodimus Prime offered a new contract, this time on Cyclonus and Scourge.
Death's Head tracked down the two Decepticons to the planet of Junk, where he was confronted by the Dark God Unicron. Unicron had already mentally ensared the Junkions, and quickly reclaimed Cyclonus and Scourge. Unicron's plan was to use a time gate to reclaim Galvatron, and use Junk as his new body.
Fortunately, Rodimus Prime and the Dinobots arrived to stop Unicron's plans. Cyclonus and Scourge fled through the time gate into Cybertron's distant past (placing them convieniently under the command of Scorponok for the Headmasters Saga). Death's Head, though, when pursuing them, wound up travelling to a completely new dimension, taking him out of the Transformers Universe for good.
- Death's Head, after being thrust into Unicron's time gate, would wind up coming face to face with the Doctor (Doctor Who) in the Doctor Who magazine. The Doctor winds up shrinking Death's Head, tricking him, and throwing him into an alternate, Transformers-free future.
- Eventually, Death's Head's time jumping lands him in the main Marvel Universe, which creates a permanent split between him and the Transformers Universe. (Though the Transformers trademarks were not used in these stories, several recognizable characters are drawn in some flashbacks.)
- In the Marvel Universe, Death's Head had many adventures. He was later killed and reincarnated as the cyborg "Death's Head II", although this newer form was usually referred to by other characters as simply "Death's Head". In the process, he lost his speech pattern, yes? All of the original Death's Head stories have been collected in two trade paperbacks by Panini Comics, as has a What If issue where he wasn't killed. Death's Head II gets no such love.
- A legion of alien robots known as Death's Heads would later trouble the Incredible Hulk on the planet Sakaar. On an alternate future Earth, one of these robots was bonded to a synthetic duplicate of the sentient energy-force known as the Uni-Power, to become Death's Head 3.0 - like his forebear, a mercenary.