Lenny Yogman (voiced by Josh Peck) 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. Lenny is the taller twin who wants to defeat Robot Jones at competitions as well as building robots to defeat Robot Jones. Additionally, Lenny enjoys humiliating and embarrassing Robot Jones whenever possible.