Dexter Season 8 Episode 4 airs on Sunday at 9 p.m. ET with an episode titled "Scar Tissue."

The episode will air on Showtime from 9 p.m. ET and can be watched online through free live stream via the link provided below.

In tonight's episode, Dr. Vogel will treat Debra for her PTSD.

Last week's episode saw Deb finally give into the notion that she would have to confess to LaGuerta's murder – that would be the only way that she could clear her conscience.

On tonight's episode, the storyline will move on and show Dexter tracking down another potential serial killer from Dr. Vogel's list.

In another part of the episode, Quinn celebrates passing the Sergeant's exam and defends Debra's honor – getting into a big rough and tumble.

The story through this season is moving now at a fast pace and this week should gather even more pace and become more excited, and be action packed as always. Fans will want to make sure they don't miss out tonight, as we are now moving into the final straight with the last episodes coming up.

Be sure to tune in for live coverage of Showtime's Dexter Season 8 episode 4, which takes place tonight at 9 p.m. ET. The full episode can be watched online through free live stream by clicking here.