'Limitless' Is the Strangest Thing on TV This Year

Limitless with Chris Hemsworth — a six-part National Geographic docuseries now streaming on Disney+ — does not immediately announce itself in this way. The show’s apparent premise is that Hemsworth, an actor who — for work reasons — has chiseled his body into a state of perfection, has decided to subject himself to a series of extreme tests of mental and bodily endurance in pursuit of longevity. He goes long-distance swimming in the Arctic, he does a rope climb over a fathomless void, he strolls out on a catwalk suspended over Sydney Harbour — stuff like that.