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Build-A-Guy is the Omnitrix's DNA sample of a Segmentasapien from the planet Polyominus and the Dimension 23 equivalent of Bloxx.


Build-A-Guy's appearance looks similar to Bloxx's. His three main colors are; white, light blue, and gray, with black lines all over his body, unlike Bloxx whose main colors are; red, blue, and yellow.

Powers and Abilities

Build-A-Guy's shapeshifting powers allow him to transform into multiple things, such as a wall, catapult, and cage. If Build-A-Guy's body is damaged or broken, he can easily reform the broken pieces immediately.

Build-A-Guy can form more blocks on his body, either to grow in size, create constructs of blocks, or change himself into a larger construct.

Build-A-Guy can willingly detach parts of his body to get out of certain situations.[1]

Build-A-Guy can turn his hands into guns[2] and fire explosive blocks from them as projectiles.[3] The blocks are also painful to step on, as seen when Humungousaur used them to pain Khyber as Tyrannopede into releasing him from his mouth.[4]

Build-A-Guy has enhanced strength, able to punch into a Dimension 12 robot and shut it down,[1] pull rocks straight out of the ground,[5] and carry Fistrick[6], as demonstrated by Bloxx. He is also very dense and durable.[7]

Similar to Rollaway, Build-A-Guy can encase people or objects inside his body, as shown when Bloxx protected Rook from dying in the Earth's atmosphere.[8]

Because he is made of building blocks, Build-A-Guy can survive in the vacuum of space. He is also immune to extremely high amounts of heat and radiation, as seen when falling through Earth's atmosphere.[8]


Despite his shape-changing abilities, Build-A-Guy can be broken when hit with enough force, but can easily rebuild himself right after.

Beings that can become intangible, such as Ectonurites, can easily phase through Build-A-Guy if he traps them in his dome form.[3]

While Build-A-Guy is highly durable to an extent, he still feels pain, as seen when Bloxx was being beaten down by Negative Ultimate Humungousaur.[9]

Build-A-Guy is vulnerable to acidic substances, whether it be liquid[10] or gaseous.[11]

Like any other organic being, Build-A-Guy is vulnerable to being erased from existence by a Chronosapien Time Bomb.[11]





Season 5

Naming and Translations

Language Name Origin
Italian Mattonatore From mattoncino,brick and costruttore, constructor
Portuguese (Br) Construtor From construtor, constructor
Russian Лего From лего, lego
Spanish (HA) El Constructor From el, the; and constructor, constructor.
Spanish (Spain) El Constructor from el constructor, The Construtor


Dimension 23 Aliens
Seen Aliens
Big BugBrainfrogBuild-A-GuyDino-MightyElectricyetiEye GuyFreezeghostFreezelizardHandy ManLightning VoltMr. MonkeyNighty KnightRollawaySpeedyquickTechno-BubbleToolboxxVomit Man
Unseen Aliens
Bat-DudeCharcoal-ManCopy CopyDog-NabbitFastcatFeedbackFish FingersFright FaceGiant-MansterHose HandsJellyFritzMr. MuckyMuck-A-MuckOrbit ManRathTeeny-WeenyWindy-Hindy
Crew's Unofficial Aliens
Trunk Man
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