Thunderhoof is a Decepticon criminal and a villain in the 2015 Transformers: Robots in Disguise cartoon. He is a elk-themed Decepticon who is a crime boss & transforms into a tractor with a thresher attachment & spoke with a mobster accent.
Prior to the events of the series, Thunderhoof was known as one of the most powerful & successful crime lord in Cybertron, until he was alerted by Clampdown to the authorities of his illegal activities, causing his downfall. He was imprisoned in the Autobot prison ship, Alchemor inside a stasis cell until the ship crashed.
After being freed in his stasis pod, Thunderhoof immediately left & plotted to return to Cybertron to reclaim his status as a crime lord. He then began tricking the local humans by posing off as a Kospego, a mythical elk creature, by intimidating them to become his new minions. He ordered them to make him an "altar" made of mechanical devices, which is actually a space bridge. After his followers failed to obtain a generator, he took matters in his own hands by stealing the local dam's generator, knocking a guarding Grimlock in the process & manages to secure the generator & left his followers to do the dirty work for him. Thunderhoof then returned after a few minutes after they finished, only to realize Bumblebee & Sideswipe have frightened his followers away, much to his dismay. He then offers the two a part of his criminal empire if they let him return to Cybertron only for Bumblebee to refuse & ordered him to surrender, only to be beaten by the latter. Sideswipe then agreed to help him, while convincing Thunderhoof not to crush Bumblebee & instead activate the space bridge. After opening the device, it worked well until it started to turn purple, resembling a black hole, sucking everything on the way. Thunderhoof then ordered Sideswipe to test the space bridge for him, only for the latter to reveal his true self by using the Decepticon Hunter as a mace, knocking the Decepticon criminal off balance & thrown into the unstable space bridge. It was then revealed he survived & was teleported into a different location in the forest. He first though he was back on Cybertron, only to realize he is still stuck on Earth & decided to recreate his criminal empire on Earth, only to be found by Steeljaw, who offered to make an alliance with him.
At some time, Steeljaw sends Thunderhoof to search for a new larger base than the Crown River Dam. He succeeded by managing to find an abandoned factory, which serve as their temporary headquarters. After Steeljaw recruited Clampdown into the team, Thunderhoof recognizes him as the informant who cause his arrest. Furious & eager for revenge, he attack the crustacean Decepticon, despite Steeljaw's protest. He chased Clampdown as the latter fled, while the rest of Steeljaw's gang followed to stop them, only for the duo to fell into a landfill. As the rest of Steeljaw's gang handled the Autobots who had come to arrest Clampdown, Thunderhoof then manages to corner the double-crosser in the crater where they struggled, head butting each other until they are knocked unconscious. They were both fortunately freed by Steeljaw before the Autobots could transport them back to base & Thunderhoof was left dismayed after Steeljaw decided to let Clampdown join the group.
Thunderhoof took part in a plan to take over the Autobots' scrapyard, though he was disgruntled at having to play the role of lackey to Steeljaw. After Underbite let the two captive humans escape, he was reluctantly teamed up with Clampdown to look for them. The pair ended up taking a ride down a rollercoaster though they manage to recapture Denny. Once the Autobots regained access to the base, Thunderhoof was defeated by Sideswipe, and later had to flee back to the Decepticon hideout with the rest of the team.
Collecting parts for the device Steeljaw's mysterious friend wanted them to build, Underbite and Thunderhoof happened across Sideswipe and Strongarm, promptly capturing the pair with Fracture's help. Thunderhoof was amused when the "First Decepticon" started torturing Clampdown to make Steeljaw comply with his wishes, and the Decepticons were soon constructing the devices Steeljaw's ally needed. When Bumblebee and Drift arrived, Steeljaw sent Thunderhoof and Underbite to deal with them, and Thunderhoof was able to pin Bumblebee long enough for Megatronus to put in his appearance. He and the other Decepticons were rendered unconscious when Optimus Prime tried to interfere with the arrival. They came around in time to prevent the Autobots getting hold of Megatronus's staff, however when Megatronus turned on Steeljaw, Underbite, Thunderhoof and Clampdown attempted to flee. They ran straight into Team Bee, who took them all out after a brief fight. They were later safely stored in stasis pods.
After Steeljaw broke into the scrapyard, he deactivated Thunderhoof's stasis pod, alongside several others, as part of a bid to bolster Glowstrike's forces. When Thunderhoof brought up Steeljaw's past failures at leadership, reminding him how he had gotten him captured, Steeljaw informed the Decepticons of his alliance with Glowstrike, and gave them coordinates to follow while he remained at the scrapyard. The escapees later reconvened at the wreck of the Alchemor's stern. There, they were inspected by Glowstrike, who seemed pleased by the new cadre of "elite warriors".
Thunderhoof gathered with Steeljaw's other followers on the roof of the ship, where he and Clampdown debated staying loyal to Steeljaw. His would-be mutiny was shut down by Steeljaw, who updated his gathered brethren about his plans to overthrow Glowstike, until she and Saberhorn arrived to talk with Steeljaw alone.
Thunderhoof was present after the Autobots staged a raid on the Decepticon base, and were subsequently surrounded by the base's occupants. Though the Autobots slipped away from them at this time, Thunderhoof and Groundpounder later cornered Grimlock, Strongarm, and Sideswipe in a communications room. While Groundpounder and Grimlock faced off, Thunderhoof gleefully used his seismic stomp attacks on the other two Autobots. But Sideswipe managed to reach the console and create a debilitating high-frequency signal. Groundpounder and Thunderhoof both proved unable to cope with the noise and were knocked unconscious. They were presumably re-frozen after Optimus and Bumblebee detonated a stasis bomb in the ship's ventilation system. Thunderhoof was then taken back to Cybertron by Optimus Prime, Windblade and Ratchet. At some later point, the Autobots used a training drone disguised as Thunderhoof in a training exercise.
When the High Council led by Cyclonus released Steeljaw from prison to keep Bumblebee and his team occupied while they made plans to summon Megatron, Thunderhoof was also released with the promise of a full pardon should the Pack succeed in terminating the Bee Team. Returning to Earth, they mounted on assault on the scrapyard which drove out the Autobots, but lost track of where their quarry had gone. Thunderhoof immediately got into a disagreement with Steeljaw and announced he was leaving the planet on his own, but Steeljaw persuaded him otherwise by mashing his face in the ground. The Pack managed to lure the Bee Team to the Crown City Dam however they conclusively lost the fight that followed, with Thunderhoof first being thrown into an overloading generator, then managing to join the other Decepticons in plunging into the raging river.
Thunderhoof and the other members of the Pack split up to search for members of the Bee Team. Gaining new orders from Soundwave, the Pack headed to a waste disposal site so they could dig up radioactive substances. The Bee Team showed up, resulting in another fight which ended when Thunderhoof used his ground stomp to open up a crevasse under the Autobots, though Steeljaw wasn't happy about the results. The Decepticons left with their prize, only to again encounter the Autobots in a warehouse, with the battle that ensued not ending favorably for the Decepticons.
Hearing that Clampdown had been arrested by the Autobots, Thunderhoof automatically assumed the 'Con had blabbed their current plan to break into the nuclear power plant. He turned out to be right, and when Clampdown arrived handcuffed to Strongarm, Thunderhoof set his sights on clobbering his fellow 'Con. His pursuit ended when Grimlock landed on him. Despite this interference, he managed to follow the Autobots into the power plant and rejoin Steeljaw, though the pair were again clobbered by Grimlock as they tried to escape with the nuclear fuel rods they'd acquired. The unconscious Thunderhoof was still mattering about Clampdown as the Autobots dragged him out of the plant. He and the other captured Pack members were later incarcerated in makeshift cells in the Autobots' cave.
When the Autobots returned to their scrapyard base, Thunderhoof and the other Decepticons were taken with them and reinstated in stasis pods. With the other imprisoned Decepticons, Thunderhoof was returned to Cybertron when the Bee Team freed it from the Decepticon High Council.
- Thunderhoof is voiced by Frank Stallone, the brother of veteran action star Sylvester Stallone.