TV Roundup: Dexter to Bloody Up CBS

• CBS will fill holes in their lineup due to the writers’ strike by airing Dexter, the edgy Showtime drama starring Michael C. Hall about a serial killer who hunts other serial killers. The network will editthe hour-long show for language and gore, making each episode about 15 minutes long.

• Late Show host David Letterman has finally shaved off his bushy strike beard. Underneath it? Narnia!

• American Gladiators is back! NBC’s remake of the 1980s athletic competition stars powerhouse gladiators named Mayhem, Crush, Venom and Stealth, which we thought were the names of Gatorade flavors. Photo: Paul Drinkwater/NBC; Jill Greenberg/Showtime