- "Robot Hell is quite real. Here's our brochure."
- "Stop that!"
- ―Beelzebot, complaining to Bender
Beelzebot, commonly referred to as the Robot Devil, is one of the recurring antagonists in Futurama. He seems to resemble the Devil/Satan/Lucifer of many Earth religions. He lives in Robot Hell along with many other sinners. He is talented at playing the fiddle, therefore, he owns a golden one (presumably a reference to "The Devil Went Down to Georgia," which mentions a golden fiddle). He lives in New Jersey and runs Robot Hell in an abandoned amusement park called Reckless Ted's Funland, which Philip J. Fry I remembers from his original century (according to him, the place was forced to shut down after a bunch of people got salmonella from the flume ride). The Fun House located inside the park houses Robot Hell, accessable via slide by pressing the symbol of Robotology (demonstrated by Fry). 
When Bender Bending Rodríguez broke his promise to Robotology under the influence of Fry and Turanga Leela, Beelzebot kidnapped him and took him to Robot Hell. However, Fry and Leela were able to save him.
Beelzebot swapped hands with Fry so that Fry could become better at playing the holophonor. He also seems to be able to summon flames and has a bit of talent with illusions demonstrated at the opera with Nixon and him supposedly engulfed in the flames. He is a bit into the theatrical, bursting into song when possible and has a bit of talent for it judging from his brief performance at the opera. 
As head of the League of Robots, Bender sold the soul of his firstborn to Beelzebot in exchange for an Army of the Damned, something Beelzebot claimed was cold-blooded even by "his" standards.(Arguments pursue whether or not that was his actual son, due his surprise and confusion in "The Bots and the Bees" because of him not knowing the facts of life.) His hands are very well coordinated.
He can swap his hands with any human very fast and the human doesn't feel any pain. His arms, legs, upper and lower torso resemble bender's body parts very much though his fingers are pointed and his feet are two-toed (much like the cloven hooves of the Christian devil) rather than Bender's semi-sphere feet. The Robot devil has backup bodies in case he dies and goes to Robot Hell.
He also has a bit of flamboyancy in his speech and movements, easily angered by being mocked. He is a bit hypocritical, once confronting Fry about his opera characters "lacking subtlety" and "announcing how they feel" by saying "That makes me feel angry!"
Despite his evil nature, he considers Bender to be more evil than he is after seeing some of the latter's acts and saying there are no robots more evil than him. (However, this could be false, due to the fact that he resembles our world's devil, known as Satan, both of which are always tricking others into doing bad deeds.)
Beelzebot has a small musical band who play the Robot Hell Theme Song. The group plays at the wedding of Lars Fillmore and Leela, and apparently seem to be able to appear whenever Beelzebot spontaneously breaks into song.
- "Hell is Other Robots"
- "A Tale of Two Santas" (voiced by Maurice LaMarche)
- "Crimes of the Hot"(cameo)
- "The Devil's Hands Are Idle Playthings"
- "Ghost in the Machines"
- "The Mutants Are Revolting" (no dialogue)
- "The Six Million Dollar Mon"
- "The Silence of the Clamps" (no dialogue)
- "Forty Percent Leadbelly"
- "The Inhuman Torch" (no dialogue)
- "Calculon 2.0"
- Bender's Big Score (No voice role)
- Bender's Game (No voice role)
- The Beast with a Billion Backs (voiced by Dan Castellaneta)
- Into the Wild Green Yonder