Something bad is coming to "The Walking Dead" -- and his name is Negan. The specter of the unseen villain has been hanging over much of the AMC zombie drama's sixth season, and he's due to arrive in this weekend's season finale episode. Series lead Andrew Lincoln has already said that Negan gets the "greatest entrance ever written," and now Norman Reedus has weighed in on what lies ahead for the series.

While speaking to Entertainment Weekly, Reedus -- who plays Daryl Dixon -- talked up the episode in a big way.

"I saw a little rough cut of it," said Reedus. "And it's the most hardcore episode we've ever shot. I couldn't speak after I watched it. And, of course, I knew what was happening, and what was going to happen, and who was involved, but I got to tell you, I couldn't speak for like an hour. And then I just was bombarded with phone calls on my drive home. But that was a rough, rough, rough cut. I will say that it might be the best episode we've ever shot of the show."

Reedus also spoke about the actor bringing Negan to life, Jeffrey Dean Morgan. "I've known Jeffrey for a long, long time," said Reedus. "He's a friend of mine, and I really respect him as an actor. And as a dude, he's just the best. It's weird to have such a nice guy playing such an a-hole, you know what I mean? But that's just the testament to how good he is. So I'm excited to see where he goes and what happens to that guy."

"The Walking Dead's" season six finale episode, "Last Day on Earth," airs this Sunday at 9 PM ET on AMC.