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(OVA) On a dark, late night in New York City, Ryu is chased and attacked by assassins. After disposing of them, he finds an I.D. card for the Friedman Company. The next day, it is announced that Dr. Ned Friedman has discovered a cure for cancer. But after providing no information at his press conference, a reporter named Sarah decides to investigate with the help of her friends Robert and Jeff. When passing by Dr. Friedman's house one day, Ryu hears the voice of a young girl calling for help. When Sarah and her entourage investigate the house as well, they run into their colleague, Ryu. Upon that, they discover Dr. Friedman has been conducting experiments on live humans using biotechnology, and that it may have something to do with the power of the Evil Gods, whom Ryu had defeated in the past. But when Ryu's friend, Irene, is kidnapped, he must don his role as a Dragon Ninja once again to defeat this new enemy and save her.

How to Watch Ninja Gaiden Legally and Safely

If you want to stream Ninja Gaiden through reputable and legal services, there are a few good options depending on where you are. Subscription platforms like HBO Max, Disney+, Netflix, Amazon Prime Video, and Apple TV+ sometimes carry Ninja Gaiden films or related DC titles—though availability depends on your country.

If you’d rather not commit to a subscription, there are ad‑supported, free (but legal) platforms such as Tubi, Pluto TV, Peacock or Crackle (where available in your region) that occasionally host superhero films.

Lastly, don’t forget about library‑linked streaming options like Kanopy or Hoopla (if your library or university is registered), and official uploads by film distributors on YouTube—these can also give you legal access to classic movies.