Grand Nagus Zek appeared in just 7 episodes, beginning with the Deep Space Nine episode 'The Nagus' and ending in 'The Dogs Of War'. His corrupt business practices and chauvenistic view of women were contrary to the staff of DS9, but critical to his enormous charm.
Wallace Shawn's magical portrayal of Zek made him a fan favorite. It is a known fact that he did not like to wear these facial appliances, so he averaged one episode per season. For this fact, I am lucky to have these unused hand and facial prostetics in my collection.