SPOILER ALERT: This article contains major spoilers for plot points and the ending of “ Wicked: For Good ,” now playing in theaters, as well as spoilers for the “Wicked” stage show.

“Wicked,” created as an origin story for Glinda the Good and the Wicked Witch of the West, sets the stage for the world of the 1939 film “ The Wizard of Oz ,” explaining that not all in Oz is what it seems.

“Wicked: Part One” established much of the lore — from Glinda and Elphaba’s first meeting at Shiz University to their fateful voyage to the Emerald City to see the Wizard — and “Wicked: For Good” continues that story, including introducing how Glinda and Elphaba become known for good and evil, how the Tin Man, the Scarecrow and the Cowardly come to be and introduce Dorothy (and her little dog Toto,

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