John Cena has been announced as this year's Shark Week host. Discovery Channel that Cena will host the 36th Shark Week, a weeklong programming block celebrating sharks. “I usually do Shark Week from my couch -- with lots of snacks, but this year I'm beyond excited to host the week dedicated to the endlessly fascinating, action heroes of the Ocean," Cena said in a statement. "It's a wild week of shocking new footage, new discoveries, and lots and lots of teeth." This year's Shark Week will feature 21 hours of new programming. Shark Week kicks off July 7 at 8 p.m. EDT on Discovery Channel.