''The Walking Dead" is one of the most popular shows on TV. "It really puts viewers into a moral dilemma," says Murali Balaji, assistant professor of media studies and production at Temple. He points out that it's not actually the zombies who are the most dangerous enemies:  "What's interesting is that the survivors view fellow survivors as suspiciously, or even more suspiciously, as the zombies themselves....That resonates with us — we all struggle with dilemmas of trust."