"Ruby Slippers" is the eighteenth episode of the fifth season of the American fantasy drama series Once Upon a Time, which aired on April 17, 2016.

The Oz events take place years after the flashback scenes from "Our Decay", they also take place immediately after Zelena is banished to Oz in "Swan Song" and before she goes back to Storybrooke in the present day scenes in "Our Decay".

The Underworld events take place after "Her Handsome Hero" In Oz, "some time ago," Ruby and Mulan encounter Dorothy Gale's dog Toto in the woods while searching for Ruby's pack.

Ruby realizes that Dorothy's late Auntie Em might be in the Underworld, and they find her at a diner she runs.

Meanwhile, David discovers that Cruella is having the phone booth removed by Claude (who was a guard for Regina that Hook killed in the season 2 "Queen of Hearts" episode) on Hades' orders; she offers to let them use it if Henry will write her back to life, but he refuses.

Henry writes story pages showing that Dorothy was successfully revived, and that Snow is with Neal in Storybrooke.

Ruby and Snow arrive in Oz to discover Mulan and the Munchkins standing vigil over the sleeping Dorothy.

According to Anders these plans were shelved due to Ory being cast in the short-lived series, Intelligence.

"True love's kiss has been a staple of this show since the beginning," executive producers Adam Horowitz and Edward Kitsis say.

"[3] The Oz scenes were shot at Everett Crowley Park in Vancouver, British Columbia.

[4] Nick Roman of Ricky.Org said: "Once Upon a Time has dealt with LGBT romance before, but never with as much depth as we get here with “Ruby Slippers”.

But I'll give them kudos for how they handled tonight's reveal of Ruby and Dorothy's feelings and subsequent kiss.