99 searches Shandar.
A famous magician, illusionist and escape artist.
Shandar - along with Tolliver and Dr. Hugo von Shickel - is one of three people who was a passenger on every flight on which a CONTROL courier has disappeared in midair and is therefore a suspect in the case.
Tolliver is drugged leaving von Shickel and Shandar as the only remaining suspects. When a cork is found which may the stopper from the vial containing the drug, Maxwell Smart and 99 think that the culprit may still have the vial.
Using her cover as a stewardess, 99 puts knock-out drops in their coffee; Max searches von Shickel and 99 searches Shandar. Both come up clean. However, Max, insisting that it must have been one of them, continues to regard Shandar as a suspect - even after the involvement of the plane's crew is revealed.
[Uncredited, Episode #89: "Closely Watched Planes".]