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Currently you are able to watch "Magnum P.I." streaming on The Roku Channel for free with ads or buy it as download on Amazon Video, Apple TV Store, Fandango At Home.
Besides streaming, you can also buy the series on DVD from Barnes & Noble, Amazon DVD / Blu-ray and watch it anytime.
Thomas Magnum, a decorated former Navy SEAL, returns home from Afghanistan and applies his military skills to become a private investigator in Hawaii taking jobs no one else will—with the help of fellow vets T.C. Calvin and Rick Wright, and former MI:6 agent, Juliet Higgins.
