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You can stream Casshan (1973) on HiDive with a subscription.

Dr. Azuma creates robots to benefit mankind, but they unexpectedly rebel and begin to destroy everything in their paths. To deal with the catastrophe, Dr. Azuma's son volunteers to become a human robot, even though he knows he will never be able to return to human form again. He confronts this grave situation to ensure a bright future for all humans.

A futuristic landscape crumbles as machines intended for peace turn their steel limbs against humanity. To halt the mechanical uprising, a desperate father transforms his own son into a cyborg, sacrificing the boy's humanity to save a dying world.