Dexter viewers got the briefest of looks at Julia Stiles last week, but we'll get to know her a lot better on this Sunday's episode.

On "Beauty and the Beast," Dexter tries to help the battered woman played by this actress, only to immediately be asked why he didn't bring her to the hospital. The reason, as we all know and as he tells the girl who claims to be named Rachel? Because she saw him.

Below, watch this interaction, as well as Dexter being chewed out by Harrison's nanny.

[video url="http://www.tvfanatic.com/videos/meeting-lumen/" title="Meeting Lumen"][/video]

[video url="http://www.tvfanatic.com/videos/parenting-debate/" title="Parenting Debate"][/video]

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