March 8, 2013 9:10 am “Grimm” Returns NBC’s fairytale thriller “Grimm” is back for its spring premiere. It returns on Friday, March 8 at 9/8c on NBC. US & World Videos 1:24 NASA releases black hole visualization 0:49 US pauses arms shipment to Israel over Rafah assault 3:06 Kim Kardashian being booed at Tom Brady's Roast edited out of Netflix special 2:49 Daughter surprises mom with emotional letter of thanks for Mother's Day 1:32 Zendaya's Met Gala style details with Law Roach