The fifth-largest comic-book publisher in the United States, IDW Publishing initially received attention for its dark, viscerally engaging horror comics, such as 30 Days of Night, which has since been adapted to film. IDW Publishing also holds some of the most prominent licenses in sci-fi and pop culture, publishing comics and graphic novels such as Angel, Star Trek, Dr. Who, 24, Terminator, Transformers, G.I. Joe, and Ghost Whisperer.