Denny Yogman (voiced by Austin Stout) is one of two fraternal twins that are rarely seen attending class. Instead they are in their laboratory located in the school's H.V.A.C. system. They wear red hats that resembles the 1980s band Devo's energy dome hats, yellow shirts, and black sneakers. Denny wears glasses shaped like goggles. Denny is the shorter twin who wants to infect Robot Jones and also to take Robot Jones's brain for various purposes. One time he used Robot Jones's brain which was installed into a larger robot. This pitted Robot Jones against himself. While Robot Jones could partially function with no brain and fight with new programming, Denny's robot crashed to the ground immediately, sending Denny away in tears.