|Don't look. He's scary.|
It took some searching, but finally he found the source of the sounds at the Entertainment Weekly site. James Hibberd says in a post there that Game of Thrones author George R. R. Martin is going to do a cameo role on Z Nation.
"What part is he going to play?" you ask.
A Zombie Author, of course.
Panzer says, "The post even has photos of Mr. Martin in Zombie makeup. Yuk!"
Note: Just a warning: You probably don't want any tea with this post, because Panzer is right, "Yuk!"
To read the post, tootle over to George R. R. Martin