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Watch The Hardy BoysNancy Drew Mysteries online — it may be available on legal streaming platforms such as YouTube, Netflix, Prime Video, Hulu, Disney+, and others.

This hour-long young adult series featured the characters from the popular children's books, "The Hardy Boys" and "Nancy Drew," in a weekly mystery. The team of Frank and Joe Hardy alternated with Nancy Drew every other week, with independent storylines. Several episodes featured a larger mystery with a cross-over scheme, involving the investigative talents all three characters.