Pretty Guardian Sailor Moon Eternal is a two-part anime film covering the Dream Arc of the Sailor Moon Crystal adaptation.
During a solar eclipse, the short-lived peace the Sailor Senshi earned by defeating Master Pharoah 90 in season 3 is disrupted when a winged horse comes to warn Usagi, Chibiusa, and Mamoru about another old enemy of Silver Millennium returning to threaten Earth. The winged horse (erroneously referred to as a "pegasus," which is the given name of a winged horse in Greek mythology, not a species name) turns out to be Helios, the guardian priest of Elysium. In another part of Tokyo, the inner Sailor Senshi spot a flying ship that disappears at the end of the eclipse. The Dead Moon Circus is eventually revealed.
Part 1 covers Super Sailor Moon, Super Sailor Chibi Moon, Tuxedo Mask, and the inner Sailor Senshi gaining their super forms and confronting the Dead Moon Circus, specifically the Amazoness Quartet and the evil witch Zirconia. The true enemy, Nehelenia, Queen of the Dark Moon, remains mostly hidden.
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