At some point before being sent after Walter Naugus, the Tails Doll engaged the Knothole Freedom Fighters on at least one occasion, demonstrating the ability to absorb materials from its surroundings and create an armored shell using its control gem. (StH: #252)
- From a reader's perspective, this picks up from where the original pre-Super Genesis Wave continuity left off.
The Tails Doll was sent by Eggman to attack Mobotropolis, due to Naugus' prior theft of Eggman's technology. Sonic and Tails returned home to find the monstrous robot on its rampage. Sonic and Tails battled the monstrous creature, and, after Sonic experienced a brief episode of confusion (in reality due to the Super Genesis Wave), they eventually caused damage through a combination Spin-Dash, only for it to repair itself using its Control Gem. Fortunately, the pair were eventually able to defeat the monster by plugging NICOLE into it, disrupting its programming enough that Sonic was able to smash through its outer shell and remove the plush Tails Doll from within. Snapping off its Control Gem, Sonic then kicked the doll into the distance, crushing the Control Gem underfoot and seemingly putting an end to the threat. (StH: #252)
Another Tails Doll was subsequently created by Eggman and prepared for use against the Sky Patrol following the defeat of the War Walrus. Later, when the Freedom Fighters were lured into a trap with a Chaos Emerald as bait, the Tails Doll slipped aboard the Sky Patrol while Team Fighters were rushing to the aid of Team Freedom. This placed it in a perfect position to monitor the mobile base's movements for Eggman. (StH: #265, #267)
The Tails Doll proved vital to Eggman, as it transmitted Sonic and Sally's broadcast to him, revealing to him that the Freedom Fighters had all seven Chaos Emeralds. This allowed Eggman to make preparations for an assault on the Freedom Fighters. Tails Doll was linked to Phage as part of the preparation. (StH: #283)
In the altered version of Sonic's World, Tails Doll's nanite disruptor was replaced with a control gem, with allowed it to absorb raw materials from nearby in order to form its protective outer shell. This barrier proved quite formidable, resisting even Sonic's Spin-Dash attack, though it proved vulnerable to a combined Spin-Dash employed by Sonic and Tails. It was capable of regenerating its armor by absorbing nearby matter, but was apparently unable to affect NICOLE in this fashion, and proved vulnerable to her infiltration of its systems.
As its name suggests, Tails Doll resembles a patchwork doll version of Tails. Its most notable feature is the red gem attached to its head by a wire. After absorbing a various materials, it took on a monstrous form bearing little resemblance to its former self, the only recognizable element being the disruptor gem. This new form almost seems to be falling apart, with red grids of circuitry showing up underneath its torn exterior. It has several tentacle-like appendages as well. In cyberspace, Tails Doll assumes a giant form of it's own head.
- Tails Doll is based off the character from Sonic R.
- Many people make up violent stories about Tails Doll on the Internet. This may have been the inspiration for Tails Doll's transformation into a monstrous being.
- Tails Doll was one of several Eggman robots featured on a variant cover for StH #275 alongside various Egg Bosses, Naugus, the Hooligans, Breezie the Hedgehog, and some of Dark Gaia's Minions.