Season 1 consists of 10 core episodes, plus a two-part "bonus" episode ("Calliope" and "A Dream of a Thousand Cats").
These are "tags" indicating the release groups or the websites where the file was originally uploaded.
The series follows Morpheus (Dream), the King of Dreams, who is captured in an occult ritual and held prisoner for 105 years. After escaping, he sets out to restore order to his realm, the Dreaming.