If you thought nothing could top Morgan Freeman talking on helium, you might want to reconsider. The June 25 episode of his Science Channel series Through the Wormhole explores the question, “Is a Zombie Apocalypse Possible?” Frightened? As Freeman told EW earlier this month, you don’t really have to be: “This whole thing with zombies is BS, for the most part. However, there is another side to that one coin: There are zombies, at least in the insect world.”