Herman is also known for his work as a voice actor in cartoons and video games, notably in Futurama, where he provides the voices of many recurring characters (including Scruffy the Janitor, Roberto the psycho robot, Mayor Poopenmeyer, and Professor Farnsworth's rival Ogden Wernstrom), and King of the Hill, for which he voiced Anthony "Twig Boy" Page (the social worker from the pilot episode who accused Hank of beating his son and from season two's "Junkie Business", where he forces Strickland Propane to hire a drug addict who has his addiction listed as a disability), Hank's childhood friend, Eustace, and other incidental characters. His other voice work includes Family Guy, American Dad!, Father of the Pride (in which he voices Roy Horn), and the Jak and Daxter video game series. He starred as Ubuntu Goode (and other supporting voices) in The Goode Family. He also provides the voice for Mr. Frond (and other supporting voices) in Fox's Bob's Burgers and from 2012 to 2015 worked on the Comedy Central series Brickleberry as self-absorbed park ranger Steve Williams.