Justice League vs. the Fatal Five

In the 31st century, Mano, Tharok and Persuader of the Fatal Five attack the Legion of Super-Heroes' headquarters for their time sphere. Star Boy, Saturn Girl and Brainiac 5 try to keep them back but fail. Just as the villains activate the sphere, Star Boy leaps at them and is taken along. Arriving in the 21st century, Star Boy triggers a trap Brainiac 5 programmed, trapping the villains inside the sphere in a stasis field. Star Boy comes down in Gotham City while the sphere ends up in Metropolis. Star Boy discovers his supply of medicine, needed to stabilize his mind, was destroyed in his rough landing. As his medicine doesn't exist yet, Star Boy's increasingly erratic behavior gets him apprehended by Batman and sent to Arkham. The stasis-locked time machine is picked up by Superman and brought to the Justice League's headquarters for analysis.

Ten months later, Jessica Cruz is struggling with the trauma of her near-death by a murderer who killed her friends, making her afraid to leave her apartment. Adding to her anxiety is that a Green Lantern ring chose her and that Wonder Woman keeps trying to recruit her into the Justice League. In Gotham, Miss Martian is trying to prove herself to Batman for membership in the League, but her inexperience works against her good intentions. While trying to unlock the secret of the strange sphere, Mister Terrific brings down the stasis field, freeing its occupants. Superman and Mister Terrific fight them, but Superman is wounded by Persuader's axe and the villains escape.

Star Boy's memory is jogged by a news report of the fight, and he breaks out of Arkham. The Justice League members compare notes about these mysterious assailants and discover they are time travelers; and from one of Star Boy's ravings, Batman deduces that they are after Jessica. When the three villains attack Jessica, Star Boy comes to her rescue, followed by Superman, Batman, Wonder Woman, Mister Terrific, and Miss Martian, who force them into flight after a hard struggle. In the aftermath, Star Boy and Jessica form a close friendship.

To find out more about their guest from the future, Batman instructs Miss Martian to telepathically link their and Jessica's minds with Star Boy's memories, thus learning about the Legion. They witness a battle between the Legion and the Fatal Five, which ended with the capture of Mano's lover Emerald Empress and Validus; as there was no prison that could hold them in the 31st century, the Legion took them to Oa in the past. Upon their awakening, the League receives an ultimatum from Mano: surrender Jessica or all American cities will be destroyed by bombs created by Tharok. The first bombings start in Metropolis, forcing the Justice League to move out. Left behind with Star Boy in the Watchtower, Jessica is contacted by Tharok through her ring, forcing her to surrender herself to the Five and enable them entry to Oa's prison cells. Despite interference by Kilowog and Salaak, Emerald Empress and Validus are freed, and when Jessica fights back, Persuader destroys her ring. Afterwards, Emerald Empress steals all the energy of the Central Power Battery, and the Five return to Earth to recover the time sphere.

In the meantime, Star Boy discovers Jessica's absence and informs the League. The heroes proceed to the time machine's location, a secret military base, where the Fatal Five force them into battle. Emerald Empress subdues the Justice League and then initiates her master plan to use the Lantern's power to destroy the Sun, wipe out humanity, and prevent the formation of the Legion in their time. On Oa, Jessica recovers her faith and determination, and by reciting her oath, she reassembles her power ring. Brought back to her apartment, Jessica flies to and destroys the Fatal Five's base, killing them.

Superman, Jessica and Star Boy race after the Eye, but are too late to prevent it from plunging into the Sun. As the star cracks apart, Star Boy sacrifices himself by lowering himself into the Sun's core and using his powers to reverse the fracturing. As the League commemorates Star Boy's heroism, they are joined by the Legion who have come from the future to honor their fallen comrade. Batman also informs Miss Martian that she has been invited to join the Justice League, and she accepts the offer.

• Kevin Conroy as Batman
• George Newbern as Superman
• Elyes Gabel as Thomas Kallor / Star Boy
• Diane Guerrero as Jessica Cruz / Green Lantern
• Susan Eisenberg as Wonder Woman
• Daniela Bobadilla as Miss Martian
• Kevin Michael Richardson as Mr. Terrific, Kilowog (uncredited)
• Tara Strong as Saturn Girl, additional voices
• Noel Fisher as Brainiac 5
• Sumalee Montano as Emerald Empress
• Philip Anthony-Rodriguez as Mano
• Peter Jessop as Tharok
• Matthew Yang King as The Persuader
• Bruce Timm as Two-Face
• Tom Kenny as Bloodsport, Salaak (uncredited)

The cast, writers and producers of Justice League vs. the Fatal Five promoting the film at the 2019 WonderCon

The director is Sam Liu, who has directed prior DC animated films. The story was written by Eric Carrasco, partnered with Jim Krieg and Alan Burnett. The film features Kevin Conroy, Susan Eisenberg, and George Newbern reprising their roles as Batman, Wonder Woman, and Superman from Justice League and other DC productions. It was Conroy's final film role before his death on November 10, 2022.

Originally, the film was set to use the Phil Bourassa art style and models from Justice League: Crisis on Two Earths and Justice League: Doom, with the voice cast already having done their recordings. However, to avoid confusion with the New 52-based DCAMU movies, the film used the animation models from Justice League/Justice League Unlimited.[10] The main title themes from The Adventures of Batman & Robin, Superman: The Animated Series, Justice League/Justice League Unlimited are included in the score by composers McCuistion, Ritmanis & Carter (all DCAU alumni) to represent their respective characters.

While its canonicity with the DC Animated Universe (DCAU) is open-ended,[11][12] executive producer Bruce Timm considers the film to be canon.[10]

The complete score was released by Dynamic Soundtrack Records on January 15, 2021. It can be purchased via Apple Music and other outlets.[13]

Reviews to the film were generally favorable.[14] On review aggregator website Rotten Tomatoes, the film holds an approval rating of 100% based on eight reviews, with an average rating of 6.6/10.[15]

Eric Vilas-Boas, writing for /Film, praised the film's handling of characters with mental health challenges.[16] Roman Julian, writing for MovieWeb, lauded the return of the classic DCAU animation, but criticized the film's "mediocre story".[17]

• Justice League vs. the Fatal Five at IMDb
• Justice League vs The Fatal Five at The World's Finest