What are the names of the characters in Get Smart?

In "Get Smart," the main characters include Maxwell Smart, played by Don Adams, who is the bumbling secret agent known as Agent 86. His partner, Agent 99, portrayed by Barbara Feldon, is a skilled operative who often helps him out of tricky situations. Other notable characters include Chief, the head of CONTROL, played by Edward Platt, and the villainous KAOS agents, including Siegfried, portrayed by Bernie Kopell.