Travelers now have one more reason to dread airports: The Undead. In a new spot directed by A Common Thread's Clay Staub for Universal Studios Hollywood and Universal Orlando Resorts, zombies from The Walking Dead terrorize, trample and devour screaming young adults, other travelers and flight attendants in a busy airport terminal. Conceived by Los Angeles agency David&Goliath;, the ad promotes the theme park's annual Halloween Horror Nights event, which this year features zombies inspired by the hit AMC series.