Pre-Super Genesis Wave continuity. The information contained applies only to that canon.
First Battle Against Mogul
Turbo Tails first appeared alongside Super Sonic and Hyper Knuckles to battle Master Mogul, having used the Chaos Emerald energies unleashed by Mogul in combination with Power Rings provided by the Ancient Walkers in order to transform. Even with the combined force of these three and their allies, though, Mogul proved insurmountable until Athair provided him with the Chaos Syphon device, allowing him to drain Mogul's powers and thus create the Master Emerald. (StH: #56)
Following a failed attempt to reason with a maddened Chaos Knuckles, Tails was taken-unconscious-to Merlin Prower, who induced his transformation into Turbo Tails to give him a fighting chance against Knuckles. However, the recently freed Mammoth Mogul used his fading powers to intervene, capturing Turbo Tails while he was still incapacitated and replacing him with a duplicate. This duplicate faced Knuckles and lost, and proceeded to take Tails' place in Knothole with no idea of the truth. The true Turbo Tails, meanwhile, was kept unconscious by Mogul and drained of energy for some time after his capture so that Mogul could regain his lost powers. Eventually, Sonic the Hedgehog and the Tails duplicate found Mogul and challenged him, learning the truth of the real Tails from Mogul. After the duplicate dissipated and Sonic defeated Mogul, the true Turbo Tails was freed and reverted to normal. (StH: #95, #96, #97, #114)
Unbeknownst to the heroes, however, Mogul had secretly placed a magical mark on Turbo Tails that would later allow him to take control of him to attack Sonic, and the power Mogul stole enabled him to steal Chaos Knuckles' own vast powers sometime later. (StH: #149, #150, #185, #186)
The Great Harmony
Turbo Tails appeared yet again when A.D.A.M. kidnapped Tails and Shadow the Hedgehog in order to bring about the Great Harmony, in which every Chaos Emerald in the galaxy was pulled to Mobius by the powers of the two captives. The immense energies of so many Chaos Emeralds transformed Tails into Turbo Tails and Shadow into Super Shadow, and the two joined forces to transport the Chaos Emeralds to the Zone of Silence and thus prevent either A.D.A.M. or Dr. Eggman from getting their hands on them. (StH: #168, #169)
Like other super transformations, Turbo Tails is practically invincible, and is able to fly without the use of his twin tails. Although not directly stated, he has also been shown to use Chaos Control in sending the Chaos Emeralds to the Zone of Silence (StH: #169).
- Unlike all other super forms, there is a bit of an inconsistency as to his appearance. Turbo Tails only consistent change is he now has a cape that sprouts out of his back. The first time he appeared, his fur was reddish orange and the cape was blue (and in point of fact, the blue cape appears to simply be the blue hooded robe he was wearing prior to the transformation). For the doppleganger's battle with Chaos Knuckles, and the Great Harmony, there was simply a red cape. As for when Sonic rescued Turbo Tails, Tails now had a red cape and red gloves. (StH: #56, #96, #97, #114)