Dorothy and the Wizard of Oz (2017)

S1E36 Sister Sister

Melinda the Mean, Glinda the Good's twin sister, is determined to take her sibling's title as the most adored witch in Oz. Believing that being good is easy, Melinda attempts several kind acts, but her true nature shines through, revealing her duplicity. Dorothy and her friends quickly realize that there's a fraud in their midst. They must locate Glinda and demonstrate to the Munchkins that she is the genuine Good Witch.