Some regular characters first appeared as mortals before establishing their well-known witch/warlock identities:

Paul Lynde: (1-26 Driving is the Only Way to Fly) Harold Harold; (2-41 The Joker is a Card) Uncle Arthur

Alice Ghostley: (2-52 Maid to Order) Naomi (ironically the Tate's maid was named Esmeralda); (6-170 Samantha's Yoo-Hoo Maid) Esmeralda

Bernard Fox: (2-63 Disappearing Samantha) Osgood Wrightmeyer; (3-105 There's Gold in Them Thar Pills) Dr. Bombay

And then look what they did with Bernie Kopell: :crazy:

(6-176 A Bunny for Tabitha) A.J. Sylvester
(6-177 Samantha's Secret Spell) Apothecary
(6-186 Samantha's Secret is Discovered) Dr. Rhinestone
(8-229 Samantha & the Loch Ness Monster) Baron
(8-235 A Plague on Maurice and Samantha) Apothecary
(8-237 A Warlock in the Grey Flannel Suit) Alonzo
(8-251 Samantha's Witchcraft Blows a Fuse) Apothecary

That was something, the same actors in different roles.