Underbite
| This article is about the Aligned Decepticon. For the Kre-O Decepticon, see Underbite (Kre-O). |
| This article is about the Prime-sequel Decepticon. For characters named Overbite, see Overbite (disambiguation). |
- Underbite is a Decepticon from the 2015 Robots in Disguise franchise portion of the Aligned continuity family.

Two things rule the thought processes of Underbite: eating and bragging. This Decepticon Chompazoid is extraordinarily proud of his strength, which increases as he consumes more metal. To him, everything is a workout, all in the goal of pumping up and bulking out. He's even gone so far as to name his forearms "Thundercruncher" (right) and "Boltsmasher" (left). He kisses them.
He claims to have devoured the entirety of Nuon City, a feat about which he brags endlessly. So proud is he that he reacts quite violently to anyone not aware of his reputation.
Physically, he has few equals... provided he's got a steady diet of metal to masticate. On mainly-organic worlds like Earth, however, his rampages can drain him quickly, leaving him with little to juice up on. So strong is his need to feed that he'll ignore threats in favor of chasing down a pick-me-up.
| “ | I know what you're thinking. Is that tall, dark, and handsome really Underbite, devourer of Nuon City? | ” |
—Underbite, "Pilot (Part 1)" | ||
Fiction
2015 Robots in Disguise cartoon
- Voice actor: Liam O'Brien (English), Kōsuke Gotō (Japanese), Silvio Pandolfi (Italian), Tilo Schmitz (German), Ridha Hassani (Arabic)

Underbite was apparently arrested for destroying Nuon City, and was incarcerated aboard the prison ship Alchemor. After it crashed on Earth, he was freed from his stasis pod by the impact, and set off in search of food. He eventually encountered Sideswipe, and after a brief chase he tangled with the rest of Bumblebee's team. After spying a nearby scrapyard through the trees, he headed off to devour that instead. Pilot (Part 1) Despite tussling with Grimlock, Underbite began chowing down on the contents of the scrapyard, only to spot a bigger prize—nearby Crown City. Unfortunately, the organic matter he encountered along the way was unsuitable for his consumption, and he slowly weakened. Using metallic bait, the Autobots managed to lure him to the edge of a quarry. Underbite managed to outfight them and prepared to munch Denny Clay's pickup truck. Fortunately, a ghostly Optimus Prime intervened and helped defeat the Decepticon. The Autobots later placed the incapacitated Underbite back in his stasis pod. Pilot (Part 2)

Underbite's stasis pod was stolen by Grimlock while the Dinobot was under the control of Minitron. Although the other Autobots were able to free Grimlock from the cyber-tick's influence, Steeljaw, who had masterminded the heist in the first place, made off with the stasis pod and reactivated Underbite. True Colors
Now a member of Steeljaw's gang, Underbite was hanging out at the Decepticon hideout with Fracture when Steeljaw arrived with newcomer Clampdown. After Clampdown fled due to Thunderhoof threatening him, the other Decepticons tracked him to a garbage tip where they encountered the Autobots. Underbite fought with Grimlock, however this time the Autobot managed to take him out- first by force-feeding him plastic and then cannonballing him. Steeljaw later freed the gang, and they escaped back to their hideout. Sideways
![]() Spoiler warning: Plot details for Lockout follow. |
![]() Spoiler warning: Plot details for Battlegrounds, Part 1 follow. |
![]() Spoiler warning: Plot details for Battlegrounds, Part 2 follow. |
2015 Robots in Disguise books
After being reprimanded by Steeljaw, Underbite and Thunderhoof went for a stroll down to the Crown City docks, where they stumbled on Slink's pet food hoarding operation. Underbite fought her lackeys Sneak and Snitch until the Autobots arrived, at which point he battled Grimlock, until the Dinobot defeated him with Bumblebee's help. When Thunderhoof brought the warehouse down, Underbite departed with all haste. Sideswipe Versus Thunderhoof
Games
Transformers: Robots in Disguise (mobile game)

- unlock Starter — 500 Energon Cubes or 10 Ultra Sparks
- unlock Cybertron — 500 Energon Cubes or 10 Ultra Sparks
- unlock Legion — 1500 Energon Cubes or 30 Ultra Sparks
- unlock Legion Clash — 1500 Energon Cubes or 30 Ultra Sparks
- unlock 1-Step — 2000 Energon Cubes or 40 Ultra Sparks
When Crown City was overrun with Insecticons, Underbite took the opportunity to join in the mayhem. The Autobots found him attacking a train, and pursued him to a square where they defeated him. Robots in Disguise (mobile game)
Toys
Robots in Disguise (2015)
One-Step Changers
- Underbite (One Step Changers, 2015)
- Japanese release date: 3-21-2015
- Japanese ID number: TAV-06
- Part of the first wave of Robots in Disguise One Step Changers, Underbite changes from a Cybertronian four-wheeled tank-like car-thing into a Chompazoid. His spring-loaded transformation to each mode is triggered by pressing his back legs together. The back of his beast-head has a spring-loaded lever that activates his bitey-jaw gimmick.
- He is adorable.
- Like all Robots in Disguise toys, he has a bordered insignia that can be scanned by the Robots in Disguise game app to temporarily unlock the One Step Changer version of him as a playable character, if the player has not permanently unlocked them yet. His badge is on the top of his head/vehicle roof. However, it can't be scanned while he's still in-package, as it's behind the front-bubble instructions.
- Caution should be used with his transformation, as many early samples would lose the ability to lock into robo-beast mode with rigorous/repeated squeezing of the haunches (vehicle is the "default" state, beast mode relies on a tensed spring to stay locked in).
Legion Class

- Underbite (Legion Class, 2015)
- Part of the third wave of Robots in Disguise Legion Class series, Underbite transforms into a Cybertronian four-wheeled tank-like car-thing into a Chompazoid.
- Like all Robots in Disguise toys, he has a bordered insignia that can be scanned by the Robots in Disguise game app to temporarily unlock the Legion version of him as a playable character, if the player has not permanently unlocked it yet. His badge is on the top of his vehicle rear/beast mode butt.
- Underbite (Clash of the Transformers 2-pack, 2015)
- Packaged with Bumblebee, This Underbite is a stealth-themed redeco of the Legion Class figure above. The 2-pack is currently released as a Toys"R"Us exclusive.
- Like his original Legion Class toy, he has a bordered insignia that can be scanned by the Robots in Disguise game app to temporarily unlock the Legion-Class Clash of the Transformers of him as a playable character, if the player has not permanently unlocked it yet. His badge is on the top of his vehicle rear/beast mode butt.
- The "Clash of the Transformers" Legion two-packs have thus far only been available as Toys"R"Us exclusives in Australia.
Merchandise

- Underbite (Tiny Titans, 2015)
- Series: 1
- Number: 7/12
- Part of the initial assortment of Tiny Titans, this super-adorable version of Underbite is a very small, soft-plastic figure of Underbite in his beast mode.
- Sold in a blindpacked baggie, he comes with a collectible card with a scan-badge, which unlocks a random amount of Energon Cube "currency" and a randomized bonus power-up item in the Robots in Disguise app.

- Underbite (Happy Meal toy, 2015)
- McNumber: 5
- Part of the Robots in Disguise McDonald's Happy Meal promotion in April and May of 2015 (alongside My Little Pony), McUnderbite is a non-transforming action figure of the beast-bot. Pushing down on his haunches sets him into a slow, steady rise until he suddenly jumps up, snapping at the air with his flappy-head.
- The bag he comes in and instruction sheet have a scan-badge that unlocks a random amount of Energon "currency" and a randomized bonus power-up item. This badge is the same for all of the Robots in Disguise Happy Meal bags and instructions.
- Underbite can also be scanned into the McDonald's McPlay app, which recognizes the toy's silhouette. Doing so unlocks Underbite's version of the "Stasis Pod Battle" game.
Notes
- Underbite is the only member of Steeljaw's gang to retain his Cybertronian vehicle mode.
Foreign names
- Japanese: Underbite (アンダーバイト Andābaito)




