The Walking Dead took viewers by surprise once again last night, as the AMC smash killed off two main characters.

Are you over the shock yet? Rick Grimes is not.

Look for the leader of the survivors to struggle big time on next Sunday's "Say the Word," while The Governor throws an unusual party in Woodbury. Watch the official network preview now:

AMC has also released a clip from the episode. It features a downtrodden Glenn, forced to dig new graves:

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.