When Ozma holds a fancy dress-up party at Emerald Castle, everybody who's anybody shows up. Including Wilhelmina, in disguise as "Sandra St. Nice" and clearly up to something.

The Wicked Witch is getting tired of the Wizard's newfound honesty. She liked it better when he was a cheat and a schemer. So she slips him a gold coin that'll give him a little magical nudge that makes him more like his old self again.