Justice Society: World War II

As the Second World War rages on, President Roosevelt receives an urgent plea from Colonel Steve Trevor (character) to mobilize the United States' might by assembling a league of extraordinary individuals. This coalition, known as the Justice Society of America, comprises Trevor, Black Canary, Hawkman, Hourman, and Jay Garrick, with Wonder Woman at its helm. The team's mission is to counter the Nazi threat, leveraging their unique abilities to safeguard the world.

Meanwhile, in the present day, Barry Allen (character) and Iris West enjoy a leisurely picnic in Metropolis, seeking respite from the demands of their daily lives. However, their tranquil afternoon is disrupted by the sudden appearance of Superman, who finds himself locked in an intense battle with Brainiac. Allen springs into action as his alter ego, The Flash, using his extraordinary speed to assist the Man of Steel. As Brainiac unleashes a Kryptonite bullet, Allen taps into the Speed Force for the first time, channeling its power to catch the projectile. A mysterious voice guides him through this transformative experience.

As the Speed Force dissipates, Allen finds himself transported to what he believes is the past, amidst a chaotic conflict between the Justice Society of America and the Nazi forces. Despite initial confusion, the JSA recognizes Allen as an ally, deducing that he has arrived from a future timeline.

The team's next mission involves infiltrating a heavily guarded Nazi fortress to rescue a codebreaker, whose deciphering skills could potentially unlock the secrets Trevor had stolen. Recognizing the risks of creating a temporal paradox, the heroes reluctantly accept Allen's assistance.

As the heroes, including "Shakespeare" (character), breach the fortress walls, they overcome formidable obstacles and discover prisoners languishing in the dungeons. A young captive, shackled and battered, recognizes Shakespeare as none other than Clark Kent, passing him a parcel containing a costume with an urgent message: he must prevent a calamity from occurring. As a guard attacks Shakespeare, bullets bounce harmlessly off his body, revealing his true identity to Allen. Furthermore, Allen learns that this is not the same Clark Kent he knew, but rather a parallel reality counterpart.

The JSA discovers the codebreaker, whom Hawkman identifies as none other than Kent Nelson, aka Doctor Fate. Allen realizes that Fate is the enigmatic figure who had been guiding him throughout his journey. According to Fate, Barry must first learn a valuable lesson and complete a crucial mission before he can return to his own reality.

With Fate's cryptic directions, the team sets their sights on the Bermuda Triangle, where the codebreaker's skills will prove instrumental in deciphering a critical message. As they navigate this treacherous region, Doctor Fate disappears into the ether, leaving Allen with a sense of foreboding and wonder.

As the Justice Society of America's submersible vessel, the Triangle, approaches its destination, it's quickly detected by Nazi warships. A barrage of depth charges cripples the engines, forcing the Flashes and Wonder Woman to take drastic action. With the enemy ships closing in, they launch a daring attack, with Wonder Woman herself taking on the Nazi vessels. Just as all hope seems lost, a contingent of Atlantean soldiers arrives on the scene, directing the heroes to a nearby outpost where they meet Aquaman, who has them imprisoned. But it soon becomes clear that this is no ordinary rescue mission - the code used by Aquaman is actually a trap, designed to ensnare our heroes. Behind the scenes, the Advisor, a ruthless telepathic mercenary, is manipulating Atlantean forces to work in tandem with the Nazis, with plans to destroy the JSA and take control of the planet once they're out of the way.

As the stakes escalate, the Flashes join forces to break free from their prison, splitting up to tackle multiple fronts. One group heads to New York City to stop the Nazi-Atlantean alliance in its tracks, while Allen and Wonder Woman set out to thwart Aquaman's plans to unleash a horde of monstrous sea creatures from the depths of the Trench.

The battle for Manhattan is intense and chaotic, with the JSA fighting valiantly against overwhelming odds. Despite their best efforts, they're initially pushed back by the Atlantean forces, only to be given new life when the sea monsters arrive on the scene. As Hawkman falls and Hourman is wounded, it's up to Garrick and Canary to destroy these behemoths and turn the tide of battle.

Meanwhile, Wonder Woman and Allen engage Aquaman in a fierce duel, with Wonder Woman using her Lasso of Truth to shatter the Atlantean king's connection to the Advisor. As Aquaman regains control of his actions, he retreats in shame, leaving his troops to withdraw from the battlefield. The Advisor, however, reveals that a devastating aerial assault by Nazi jet bombers is imminent before meeting a gruesome end at the hands of Barry.

As the dust settles, Kent returns, wearing the costume given to him by Trevor, and sets about destroying the incoming bombers. In his final moments, Trevor proposes marriage to Wonder Woman, who accepts. The Advisor's body is later found, but not before he manages to escape and exact a measure of revenge on the JSA.

As Allen prepares to return to his own Earth, he says goodbye to the Justice Society, receiving a ring from Trevor as a reminder of their bond. With this token in hand, Wonder Woman warns him against putting off for tomorrow what can be done today. Back on his home turf, Allen uses his combined speed with Garrick to send himself back in time, just moments before he originally intervened to save Iris. Having defeated Brainiac and saved the day once more, Allen proposes marriage to his beloved, who accepts.

In the aftermath of these events, the JSA vows to avenge Trevor's tragic loss, while Allen looks to the future, proposing the formation of a superhero team dedicated to combating threats that span multiple dimensions. With Iris by his side, he sets out to make this vision a reality.