When the Decepticons attempted to seize the power of the Plasma Energy Chamber in 2007, a group of Autobots were blasted across the galaxy to the planet Nebulos by the ancient foundry's energies, where they took up with a group of rebel Nebulons. To fight the Hive, the evil rulers of Nebulos, some of the Autobots and Nebulons bonded their bodies and minds together, becoming Headmasters, serving up a definitive defeat to the Decepticons pursuing them. This group of Decepticons was then approached by the Hive, who sought to replicate the Headmaster process with them, but Cyclonus was able to bargain them to down to taking only half the Decepticons' heads, offering up the weapons of the others as alternatives. Using Nebulan technology, the guns were engineered into transforming exo-suits which were donned by five members of the Hive, creating the Targetmasters, giving their Transformer wielders ten times the accuracy and firepower.
The Decepticon Targetmasters overcame the Autobots and reclaimed the key to the Plasma Energy Chamber, but in the struggle, the Autobot Brainstorm was able to scan Cyclonus's partner, Nightstick, and that data was used to duplicate the Targetmaster process with the remaining Autobots and Nebulan rebels, creating the Autobot Targetmasters. Their power, however, was nothing in the face of the Decepticons' newest weapon, the super robot, Scorponok, who transported the Decepticon forces back to Cybertron, where their plans were foiled by Spike Witwicky and Fortress Maximus.
In the world of Transformers: Headmasters, there are no Nebulons - the Headmasters themselves are simply small Transformers, who, having settled on the planet Master, learned to transform into heads and connect to lifeless larger bodies named Transtectors. It was to Master that the Decepticon forces returned after the Autobots forced them to flee Earth, and consequently, a ship was dispatched by the planet's inhabitants to alert the Earth-bound Autobots to the Decepticon invasion. At the same time, the youthful Autobot, Wheelie, had summoned three of his old superior officers - Pointblank (Blanker in Japan), Sureshot and Crosshairs - to Earth to aid in the clean-up operation currently going on, when Autobot Headmaster Chromedome accidentally activated one of the plasma bombs the Decepticons had left behind. Heading out into space so that the bomb might harmlessly explode out in the void, the Autobots then crossed paths with the approaching Master ship, which was being pursued by the Decepticon Sixshot and three new troops - Slugslinger, Misfire and Triggerhappy. As Pointblank and his men tangled with the Decepticons, the Master refugees offered their help by transporting away the plasma bombs, only to have the bombs detonate in the middle of the battlefield.
Recovering from the explosion, Pointblank, Crosshairs and Sureshot discovered that the six Master refugees had been fused to their arms. Although Fortress was able to surgically remove them, a bond now existed between the larger Transformers and the Master refugees, who could now freely attach and detach to their wrists as guns. Unfortunately for these new Targetmasters, the same had happened to Slugslinger and his fellows. The Targetmasters joined up with Fortress's crew on the mission to Master, but quickly clashed with the Headmasters - Pointblank and his men were hard, experienced warriors who thought little of the Headmasters, and Pointblank spent a good deal of time attempting to soothe Chromedome's fiery temper to improve his battle ability.
Two additional Targetmaster toys were available exclusively in Japan - Stepper, a recolor on the 1984 toy, Jazz, and Artfire, a recolor of 1985's Inferno. These two were armed with Nightstick and Fracas, respectively, although the guns went unnamed. The characters themselves did not appear in the Headmasters animated series, featuring only in the official manga of the series. Rare and much-sought-after for some time, Stepper was eventually reissued in 2004, and even made it to the US in their Commemorative Series reissue line, now with the name Ricochet.
Additionally, the combining sub-group, the Seacons, were sold under the Targetmasters banner, due to their ability to become weapons that could be wielded by their combined form, Piranacon. For information on those characters, see their own article.
The Autobot Double Targetmasters' roles were brief ones — they were seen participating in a raid on Cybertron led by Jazz, Grimlock and Bumblebee. The Decepticons, on the other hand, played more prominent parts as troops under the command of Thunderwing who served him during his quest for the lost Creation Matrix - Spinister, in particular, came to doubt Thunderwing's sanity as his commands became more and more unhinged. Needlenose, though seen often during the Matrix Quest, seems to be unnerved by Thunderwing's later erratic behavior, but not to the point of complaining. Quake, in turn, is noted for his durability, having taken fatal damage from Unicron during the Chaos-Bringer's attack on Cybertron and lived to tell the tale.
Also, across the Atlantic in the UK's exclusive Transformers title, the Decepticon Double Targetmasters became a part of the new Mayhem Attack Squad, charged with hunting down and killing the renegade Decepticons, Catilla and Carnivac. The cowardly Needlenose was given leeway by Spinister and allowed onto the mission, but after the successful murder of Catilla, his nervousness consumed him. Fearing retribution from Carnivac, he subjected his fellow troops to unregistered timing exercises, earning him nothing but their ire and a lack of credibility — something that came back to haunt him when he was attacked and killed by a vengeful Carnivac, and his fellow Decepticons refused to heed his calls for help.