Best Sci-Fi Anime to Watch Free & Legally

In the world of scientific discovery, eccentric genius Rintarou Okabe is driven by an insatiable curiosity. Alongside his loyal companions Mayuri Shiina and Itaru Hashida, Okabe establishes the Future Gadget Laboratory, aiming to push the boundaries of human understanding. Their most notable achievement is a microwave capable of transforming bananas into a peculiar green substance, a feat that has garnered little attention. However, Okabe's life takes an unexpected turn when he attends a conference on time travel, where a series of bizarre events unfolds. He soon discovers that the "Phone Microwave" has the astonishing ability to send text messages into the past, sparking a chain reaction of unforeseen consequences. As he delves deeper into the mysteries of his invention, Okabe attracts the attention of the enigmatic organization SERN, setting him on a perilous path. With his world rapidly unraveling, Okabe must navigate the treacherous landscape of time travel to prevent catastrophic damage to the timeline. As he struggles to safeguard his loved ones and maintain his grip on reality, Okabe finds himself caught in a desperate battle to prevent the unraveling of his own sanity.

In the aftermath of the Black Rebellion, the once-promising resistance movement is now on the brink of collapse. With Zero's whereabouts unknown, the Black Knights are struggling to find their footing against the relentless brutality of the Holy Britannian Empire. The Elevens, caught in the crossfire, are subjected to an unprecedented wave of oppression, their hopes of a better future dwindling by the day. Meanwhile, Lelouch Lamperouge, the former masked vigilante, has undergone a dramatic transformation. Amnesiac and unaware of his double life, he's living a normal high school life at Ashford Academy, surrounded by friends who know him only as a carefree student. Unbeknownst to Lelouch, his former partner C.C. is secretly working to awaken his memories, desperate to revive the revolutionary spirit that once drove Zero to action. As the stakes grow higher, the stage is set for a thrilling new chapter in the struggle for independence. With the Empire's grip tightening and the Black Knights reeling, Lelouch's rediscovery of his past purpose could be the spark that reignites the flames of rebellion. But at what cost, and will he be able to reclaim his role as the mastermind behind the masked vigilante Zero?

In a distant future where humanity has colonized other planets, crime knows no bounds. Bounty hunters like Spike Spiegel and Jet Black roam the galaxy, taking on high-stakes missions to make a living. With a troubled past that continues to haunt him, Spike's tough exterior hides a deep emotional scar. Jet, on the other hand, keeps his own demons at bay by focusing on the present, including his care for Spike and their trusty spaceship, the Bebop. The duo's unconventional family is soon joined by Faye Valentine, a cunning con artist with a penchant for trouble, and Edward, a peculiar and enigmatic young boy. Rounding out the group is Ein, a genetically engineered Welsh corgi with an uncanny ability to sense danger. As they navigate the complexities of their relationships and take on a diverse array of criminal targets, the Bebop crew finds themselves drawn into a web of danger and intrigue. When a mysterious threat from Spike's past begins to surface, he must confront the ghosts of his former life and make a choice between pursuing revenge or embracing his newfound sense of belonging with his eccentric family. As the stakes grow higher, Spike's loyalty is put to the test, and the fate of the Bebop crew hangs in the balance.

As the war between the Republic of San Magnolia and the Legion rages on, Vladilena Milizé continues to command a new squadron of 86th faction soldiers, her existence shrouded in the Republic's relentless propaganda machine. Meanwhile, on the Western Front, Shinei Nouzen and his team find themselves in a rare moment of respite, granted full citizenship and freedom by the newly formed Federal Republic of Giad. They're welcomed into the president's own home, where they meet his adopted daughter, Augusta Frederica Adel-Adler, the last Empress of the Giadian Empire. Despite their newfound comfort, Shinei and his squad soon find themselves itching for battle, their sense of purpose tied to the front lines. They're soon reunited with Augusta Frederica as part of the Federacy's Nordlicht Squadron, facing off against the Legion once more. As they fight on, they're forced to confront the harsh reality that death and pain are the only constants in their existence, regardless of which side they're on.

In the year 2010, the Holy Empire of Britannia has established itself as a formidable force, its conquest of Japan a mere precursor to a broader campaign of domination. The Japanese people, now rebranded as Area 11, fight back against their oppressors with every ounce of strength they possess. Amidst this turmoil, Lelouch Lamperouge, a Britannian student, finds himself at the mercy of fate as he's caught in the crosshairs of both the Britannian military and the Area 11 rebels. His life is forever changed when a mysterious girl named C.C. intervenes, gifting him the extraordinary ability known as Geass, the "Power of Kings." This newfound power allows Lelouch to command absolute obedience from others, and he seizes the opportunity to exact revenge against Britannia as the enigmatic masked vigilante, Zero. With his newfound abilities, Lelouch sets out on a perilous quest to topple the Britannian Empire and reclaim his homeland's freedom.

In the depths of an underground village, two young men, Kamina and Simon, live in a world shrouded in mystery. Kamina, a charismatic rebel, dreams of making a name for himself, while Simon, a timid soul, lacks direction. Their lives take a dramatic turn when Simon uncovers an ancient relic, which they dub Lagann, igniting a chain reaction that propels them onto the surface. There, they meet Yoko Littner, a fiery redhead wielding a massive gun, who joins their quest. As they venture into the unknown, the trio faces formidable foes: the Beastmen, humanoid creatures terrorizing the remnants of humanity in behemoth robots called Gunmen. With their newfound allies, they embark on a perilous journey to reclaim the surface, unraveling a cosmic enigma along the way. As they battle against insurmountable odds, Simon and Kamina discover their own strengths, and the true meaning of courage and camaraderie.

In the neon-lit underbelly of Night City, the American dream has gone dark. For David Martinez, a scrappy teenager from the wrong side of the tracks, the only way to escape the cycle of poverty is to climb the corporate ladder at Arasaka, the behemoth security corporation. His mother's relentless efforts to keep their family afloat are fueled by her own unfulfilled aspirations, which she hopes to see realized through her son's success. But when a brutal encounter with a street gang leaves David's life in shambles, he discovers a chance to turn the tables. A mysterious cyberware, known as Sandevistan, grants its wearer superhuman speed, and David seizes the opportunity to exact revenge on his tormentors. However, his newfound abilities come at a steep price: expulsion from the prestigious Arasaka Academy and the crushing of his mother's dreams. As David navigates the treacherous world of Edgerunners – a group of cyber-enhanced outcasts who live by their own rules – he meets Lucy, a ravishing data thief with a proposition that could change his fate. But in the shadows of Night City, where the lines between humanity and machine are constantly blurred, David must confront the harsh realities of his new existence and decide whether the thrill of the Edgerunner lifestyle is worth the ultimate cost: his very soul.

In the aftermath of his failed attempt to rescue his dear friend Kurisu, Okabe has abandoned his alter ego and now leads a mundane college life, struggling to shake off the trauma of his past. As he navigates his new reality, he meets Maho, a feisty and charming individual who's part of a revolutionary project unveiling a groundbreaking AI technology called Amadeus. This AI can store and simulate a person's memories, personality, and quirks, allowing users to interact with a perfect digital replica. Okabe is drawn into the project, and his involvement takes a surprising turn when he discovers that Amadeus has been programmed with Kurisu's memories. As he delves deeper into the simulation, Okabe finds himself torn between his desire to reconnect with his lost friend and the looming danger of disrupting the timeline. With each passing moment, the stakes grow higher, and Okabe must confront the devastating consequences of meddling with the fabric of time. Will he be able to find a way to reconcile his past and present, or will the weight of his memories crush him?

In a world where robots and humans coexist, a shocking murder rocks the community when Montblanc, a legendary war hero robot, meets his untimely demise. The investigation led by Gesicht, a brilliant android detective, reveals a puzzling lack of human evidence at the crime scene, hinting that the killer may not be human after all. As Gesicht delves deeper, he discovers a pattern in the murders: all victims are retired elite war robots, and the killer seems to be targeting the most powerful machines ever designed. With the body count rising and the remaining war veterans in grave danger, Gesicht joins forces with Atom, a cutting-edge android with a human-like appearance. Together, they embark on a perilous quest to track down the elusive killer before they strike again. As they dig deeper, they unravel a complex web of secrets and lies that threaten to destroy the fragile balance between humans and robots. With time running out, Gesicht and Atom must use their exceptional skills to prevent a catastrophic outcome that could have far-reaching consequences for society.

In a world where humans and advanced artificial intelligence coexist, a catastrophic future looms on the horizon. To prevent the impending doom, a scientist takes a drastic gamble by sending a relic from the past back in time. Vivy, a pioneering autonomous AI, is a talented songstress programmed to spread joy through her melodious voice. Stuck in a theme park, she performs day in and day out, yearning for a true connection with her audience. However, her routine is disrupted by an enigmatic AI from the future, who enlists Vivy's help to alter the course of history. With the weight of this revelation settling in, Vivy embarks on a perilous journey spanning a century, racing against time to prevent a devastating war that will soon ravage the world.