Army buddy of Maxwell Smart who was a sergeant during the Korean War when Max was a corporal. 15 years later, Sid, now a bridal gown salesman, shows up in Washington for a reunion. Mistaking a "little black book" left in Max's apartment by a defecting KAOS agent for Max's address book, Sid stumbles into the middle of a case Max is working on when he calls a number in the book for a date, inadvertently alerting the Maestro. Refusing to believe that Max is now an intelligence agent, he compounds his error by handing over the book to end a fight he thinks Max has started for nothing.