- Title: Kamen Rider W Returns : Kamen Rider Eternal Movie
- Alternative Title: 仮面ライダーＷ（ダブル） RETURNS - 仮面ライダーエターナル Kamen Raidā Daburu Ritānzu - Kamen Raidā Etānaru
- Number of Episode: 1
- More Info: http://kamenrider.wikia.com/wiki/Kamen_Rider_W_Returns:_Kamen_Rider_Eternal
- Summary:After taking out a Sweets Dopant, Kamen Rider Double encounters a strange woman who tries to kill the two-as-one Kamen Rider with her psychic powers to avenge Katsumi Daido, the man who almost destroyed Futo. Assuming LunaMetal to restrain her, Shotaro and Philip demand answers on why she would avenge the death of a terrorist. However, upon revealing a harmonica that was his, the psychic reveals that Daido was actually a hero before his attack on the city. She then proceeds to tell the story of Katsumi Daido.
The scene flashes back to Daido's death and conversion by his mother Maria Daido into the first undead Necro-Over, or NEVER. However, after passing every inhumane experimentation, Daido learns that NEVER Project was rejected by Foundation X in favor of the Museum's Gaia Memories, due to the Memories' ease of production and diversity in abilities. He responds to the Foundation's messengers by telling them that NEVER has only just begun. Sometime later, Daido and his fellow NEVER mercinaries - expert marksman Ken Ashihara, former Yakuza subordinate Kyosui Izumi and strongman Gozo Domoto - revive Reika Hanehara, a serial criminal who was gunned down escaping from prison, as the newest member of NEVER. Daido leads his group of six to a Southeast Asian country only known as "S" to take out the leader of a terrorist cell located there. However, NEVER finds the terrorist leader murdered by the psychic as she overwhelms the undead supersoldiers with her powers. Daido takes the psychic down after the use of her powers wears her down, but spares her life as he realized she was forced to fight. She introduces herself as Mina before a pair of psychic soldiers, Lloyd and Shion, revealing them and Mina to be Quarks: The product of research by Doctor Prospect, a Foundation X scientist. Taking Mina with them, Daido and Reika are confronted by Foundation X's Jun Kazu, who assumes the form of Kamen Rider Eternal Red Flare. When Daido touches the Lost Driver out of an inexplicable attraction to the Gaia Memory, Kazu is forced to eject the incompatible Eternal Memory and uses his psychic power on Daido and Reika before Mina turns herself as Kazu decides to bring the two Necro-Overs with them for Prospect to study.
Coming to, Daido finds himself among Quarks who intend to kill him to prove their worth. After seeing the Quarks are forced into doing what Prospect orders them to do, Daido fights them off before Mina stops them as she sees Daido to have something Prospect lacks. By then, Prospect arrives and reveals his Eyes Memory allows him to use Quarks, under his control. When Daido asks if his ability can be negated should he die, becomes the Eyes Dopant to eliminate Daido as his body begins to fail him. However, after breaking free from her confinement in the complex, Reika arrives to spirit Daido away. Mina finds Daido's harmonica and tracks Daido down to return it, but accidentally accesses his memories when he states his intent to kill Prospect. She reveals that the Heaven's Fall barrier around the Quarks' camp would eventually eliminate those with barely psychic ability and less. Taking Reika's emergency bio-stabilizer at her request, Daido revitalizes himself as he and Reika free the Quarks despite their refusal to listen. After using his harmonica to calm them down, Daido gives the Quarks the drive to rebel before giving Mina the harmonica and going off towards the complex.
As Reika and the Quarks fight off the Foundation X Quarks, Daido makes his way to Prospect's manor where he is confronted by Kazu as he reveals Museum's location in Futo before becoming the Utopia Dopant, stating that the Eternal Memory is malfunctioning. Though no match for the Utopia Dopant, Daido manages to get the Eternal Memory and his perfect synchronization with it allows him to transform into Kamen Rider Eternal Blue Flare. With his new-found power, Eternal kills Kazu and destroys Prospect's controls of Heaven's Fall. As the rest of NEVER arrives to take out his soldiers and get the Quarks out, the Eyes Dopant attacks Eternal before revealing that all he did was ensure they die a painful death. Despite making his way to them, Daido arrives too late to save the Quarks as Prospect reveals his power over the Quarks is to kill them should they leave the complex. Mina is the only one left standing until she collapses in Daido's arms.
The Eyes Dopant's intent to break Daido only drives him utterly insane as he thanks Prospect for reminding him that all people are devils before he transforms into Kamen Rider Eternal to fight the Eyes Dopant with the support from his group before he finishes the job with the Eternal Requiem Maximum Drive. As Prospect dies from his own Gaia Memory effect, Daido realizes that the Eternal Memory finally broke down, ejecting and commenting that he "shall see it again" before discarding it. Refusing to revive Mina as a Necro-Over at Reika's request, the maddened Daido decides to stick it to the Museum by going to Futo. However, as Kazu is taken by his fellow Foundation X members to be converted into a Necro-Over, it is revealed that Mina survived the Eyes Dopant's attack.
With her story finished, Shotaro and Philip try to comfort Mina as she knew he was evil yet wanted the two to know what Daido was really like. As she is taken to the hospital, Shotaro and Philip arrive to the site of their fight with Kamen Rider Eternal to pay their final respects to Daido, stating that although he wronged the city, he was at least once a hero.