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The Lethe, also known as the River of Forgetfulness, is an Underworld location on ABC's Once Upon a Time. It first appears in the twelfth episode of the fifth season.
The Lethe is based on the river of the same name from Greek mythology.
History
The Lethe is one of the five rivers in Hades' lair in the Underworld. A spring from the Lethe also runs near Cora's manor in the Enchanted Forest. One day, Cora brings Regina's half-sister Zelena to the manor to heal Regina. The girls bond and are delighted when they discover that they are sisters. Although they desire to stay together, Cora drags Zelena back to Oz and uses water from the Lethe to make them forget they ever met. ("Sisters")
In the Underworld decades later, in a plan with Regina to erase Hades from Zelena's mind, Cora shows up at Zelena's farmhouse to reconcile with her, while Regina sneaks in from the back. Cora gets a glass of water for her, that Regina put water from the Lethe in. Zelena figures out what Cora and Regina are up to, but when she picks a fight with Regina, Cora restores the sisters' lost memories of each other. ("Sisters")
Appearances
| Once Upon a Time: Season Five | |||||||||||
| "The Dark Swan": | "The Price": | "Siege Perilous": | "The Broken Kingdom": | "Dreamcatcher": | "The Bear and the Bow": | "Nimue": | "Birth": | "The Bear King": | "Broken Heart": | "Swan Song": | |
| Absent | Absent | Absent | Absent | Absent | Absent | Absent | Absent | Absent | Absent | Absent | |
| "Souls of the Departed": | "Labor of Love": | "Devil's Due": | "The Brothers Jones": | "Our Decay": | "Her Handsome Hero": | "Ruby Slippers": | "Sisters": | "Firebird": | "Last Rites": | "Only You": | "An Untold Story": |
| Appears | Appears | Appears | Appears | Appears | Appears | Appears | Appears | Appears | Appears | Absent | Absent |
| Other Appearances | ||||||||||
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