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Six friends enter the strange town of Old Mines for a weekend float trip. They quickly realize that the town is not friendly to strangers, and they are pressured to leave by the police. When the friends decide to continue their float trip anyway, terrifying secrets of the town surface. A seven-foot-tall deformed maniac, known by the townsfolk as The Boy is kept under lock and key by the town's mayor. The Boy's purpose is simple: kill outsiders. The Mayor of Old Mines releases The Boy and the maniac's hunt begins. One by one, the campers on their float trip are ripped to gory shreds by the enraged, deformed, hulking Boy. But there is great mystery to the Boy. Who is his father? Who is his mother? How did he become so dangerous? In the end, the answers to these questions will put the entire town of Old Mines in danger. The Boy is an unstoppable killing machine, and anyone in his path won't be in one piece for long!

How to Watch The Undertow Legally and Safely

If you want to stream The Undertow 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 The Undertow 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.