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Sam Dietz is back and must find and stop another serial killer before he kills again. Detective work for Dietz is tough having to juggle two gorgeous women - one his partner, and the other his shrink, who holds the key to the case.

How to Watch Relentless IV: Ashes to Ashes Legally and Safely

If you want to stream Relentless IV: Ashes to Ashes 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 Relentless IV: Ashes to Ashes 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.