Leadside's connection to KAOS is somewhat vague; a reported meeting with the KAOS department heads turns out to be a planted decoy story. His acquaintance with Maxwell Smart goes back ten years during which Max repeatedly ruins Leadside's schemes with what Leadside calls Max's "cunning stupidity". He accomplishes the first easily enough when Max becomes distracted after jamming his foot in a cuspidor. He then "destroys" CONTROL by virtue of the sabotage of the computer known as ARDVARC - the brains of CONTROL. Portrayed by Ronald Long [Episode #109: "Leadside"].