Once Upon a Time (2011) Season 5 Episode 18: Ruby Slippers at Couchtuner
In flashbacks, Ruby and Mulan find themselves in Oz, where they meet Dorothy. After the three witness Zelena’s return to Oz, they look for a way to defeat her once and for all. However, Dorothy mysteriously disappears, and Ruby’s search for her new friend lands her in the Underworld.
Watch it here : Once Upon a Time (2011) Season 5 Episode 18