'Wicked: For Good' happens at the same time as 'The Wizard of Oz.' Here's how the stories fit together on a timeline.

• "Wicked: For Good" is the sequel to "Wicked," a musical prequel to "The Wizard of Oz." • Dorothy's adventure in Oz happens concurrently with the events in "Wicked: For Good." • Here's what you need to know about how the two stories intersect.

Note: Major spoilers ahead for "Wicked" and minor spoilers for "Wicked: For Good."

Last year's musical blockbuster "Wicked" was clearly presented as a prequel to "The Wizard of Oz," but its sequel, "Wicked: For Good," overlaps heavily with Dorothy's adventures in Munchkinland and the Emerald City.

The 1939 film starring Judy Garland and other interpretations of Oz, such as the '70s-era musical "The Wiz," are based on the original book by Frank L. Baum, "The Wonderful Wizard of Oz," written in 1900.

However, the Broadway show "Wicked" and its