It's Shark Week on the Discovery Channel - starting with Olympic champ Michael Phelps racing a Great White shark at 8 p.m. Sunday, July 23. A fin (ha!) time will be had by all. Also showing: "Ozark," about a ruined financial planner (Jason Bateman) who flees turmoil for the supposed peace of the great outdoors, makes its 10-episode Netflix bow on Friday, July 21.