The two-part film stars Kotono Mitsuishi as the voice of Sailor Moon alongside Hisako Kanemoto, Rina Satō, Ami Koshimizu, Shizuka Itō, Misato Fukuen, Kenji Nojima, Junko Minagawa, Sayaka Ohara, Ai Maeda, Yukiyo Fujii, Ryō Hirohashi, Taishi Murata, Shoko Nakagawa, Yoshitsugu Matsuoka, Naomi Watanabe, and Nanao.

[7][8] Six months after the Mugen Academy incident,[b] Usagi Tsukino and Chibiusa receive a vision from a pegasus named Helios asking for their help, and Mamoru Chiba gets a stabbing feeling in his chest.

The circus' ringleader Zirconia is instructed by her master, Queen Nehelenia, to let the Super Sailor Guardians' nightmares take hold of them so she can obtain the Silver Crystal.

However, the girls break free of them and transform with their respective Sailor Crystals into their Super forms, enabling them to destroy the Amazon Trio.

Usagi then falls ill from a black rose inside her, and Zirconia brings darkness to Earth with the nightmare energy she has accumulated.

In a dying act, Helios sends Elysion's purifying crystals to Earth, blocking Zirconia's fog, and heals the group.

After their exchange was escalated, Nehelenia was permanently sealed inside her mirror by Queen Serenity, but not before cursing the princess and the Silver Millennium to their downfall.

Mamoru wonders if the warm feeling in his chest is caused by the Golden Crystal, but Usagi assures that it's a star shining in his heart.

[17][18] Later, on June 30 of the same year, it was revealed that the fourth season based on Dream arc of the manga was to be produced as a two-part theatrical anime film project.

[25] Most of the main voice actors from Sailor Moon Crystal had returned for the two-part film, but, for unknown reasons, Taishi Murata took over Yohei Oobayashi's role as Artemis.

The following week, Reina Ueda, Sumire Morohoshi, Yūko Hara, and Rie Takahashi were cast as the Amazoness Quartet: CereCere, PallaPalla, JunJun, and VesVes.

[e] The song's lyrics were written by Naoko Takeuchi (under the name of "Sumire Shirobara"), composed by Akiko Kosaka, and arranged by Gesshoku Kaigi.

[32] In late April 2021, it was announced that Netflix acquired the streaming rights for the two-part film, and it premiered worldwide (excluding Japan and Mainland China) on June 3, 2021.

[36] Victoria Johnson of Polygon gave a positive review, and wrote "At its heart, Pretty Guardian Sailor Moon Eternal The Movie is about overcoming evil with the power of love and friendship.

[38] Rosie Knight from IGN labeled the two films as a "good adventure that boasts stunning animation, vibrant storytelling, and the return of our favorite magical girl Sailor Scouts in a dynamic double bill that will inspire and entertain.

"[40] A sequel was hinted at the end of the second film during its Japanese theatrical release, with an English teaser-line, "To be continued..."[41] On April 28, 2022, during the Sailor Moon 30th anniversary livestream, the sequel covering the Stars arc of the manga, was announced as a two-part anime film, titled Pretty Guardian Sailor Moon Cosmos The Movie (劇場版「美少女戦士セーラームーンCosmos」, Gekijōban Bishōjo Senshi Sērā Mūn Kosumosu).