- "No, no, put that down. That is worth more than you or me."
- ―Happy Hogan to Dum-E
Dum-E and U are a pair of hydraulic arm robots Tony Stark uses as assistants in his workshop. He made Dum-E in his father's workshop. While Dum-E is generally used to help with Tony Stark's creations, U is used to do the registration of Stark's work using a video camera. They had even saved his life, yet Stark constantly gets angry at the robots. Dum-E and U had helped make some of Stark's armors.
Tony Stark created Dum-E in his father's workshop, at the age of 16 while he was a student at the MIT, upgrading it with a small A.I. to recognize Stark's voice commands. Despite his later innovations, Stark kept it over the years.
Dum-E and U helped Tony Stark create the Iron Man Armor: Mark II in his workshop, helping with assembling the armor. When Obadiah Stane decided to steal his Arc Reactor, Stark almost died and went to his garage to get the arc reactor on a mantle that Pepper Potts made for him. He was unable to reach it and gave up, but Dum-E gave it to him and saved his life.
The New Element
Tony Stark used U to serve champagne when he appointed Pepper Potts as his successor and new CEO of Stark Industries. After Stark learned of a new element discovered by his father, he decided to rebuild the element to fix his current arc reactor. Dum-E helped him make the element. Afterward, Stark tasked Dum-E with cleaning up the mess that the new element's creation caused.
While Tony Stark was testing the Mark XLII, he gave Dum-E a Dunce cap for something it had done. When Tony Stark's Mansion was destroyed, both Dum-E and U were destroyed as well. When Stark returned to the ruins of his destroyed house, he recovered the robots' remains and parts of his workshop.
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- Dum-E's and U's names are a play on the words "Dummy" and "You" respectively.