On Sunday's new episode of Dexter, everyone's favorite mass murderer will attempt to get even closer to Arthur Mitchell.

What makes this storyline so compelling is the fact that Dexter clearly wants to carve Trinity up, but he also wants to legitimately learn from him.

John Lithgow's performance, meanwhile, gives us the chills. Is he on to Dexter? Or is his benevolent persona the real thing? We'll be clued to our screen through December, itching to find out.

Check out a clip from "Slack Tide" below and remember to visit TV Fanatic after the episode ends for a full recap and review, complete with the latest Dexter quotes and more...

[video url="http://www.tvfanatic.com/videos/slack-tide-clip/" title="Slack Tide Clip"] [/video]

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