Identical twin brother of leading KAOS agent Siegfried or, more accurately, one of a set of triplets, the third being a girl.
Professor Helmut Schmelding is "persuaded" by Maxwell Smart to impersonate his brother in order to infiltrate a KAOS installation ("the old, old Trojan Horse trick") but the ruse is foiled by an uncharacteristically observant Shtarker.
Portrayed by Bernie Kopell [TV Movie: "Get Smart, Again!"].