Get Smart - 3x24 - The Hot Line

A KAOS voice impersonator (John Byner) fires the Chief over the phone while pretending to be President Johnson. Max becomes the new Chief; the Chief reverts to his old status as Agent Q, and realizes he can only save his old job by discovering the location of a KAOS communications center. The title refers to telephone connection between the White House and the Kremlin set up after the Cuban Missile Crisis that almost caused nuclear war.