Michael C. Hall, Jennifer Carpenter, Julie Benz
Seasons: 1-3
Network: Showtime

Story: Dexter Morgan works for the Miami Metro Police Department as a blood pattern analyst. That's just his day job, at night he's a serial killer who goes around killing off some of societies less desirable elements.

Matthew Fox, Evangeline Lilly, Josh Holloway
Seasons: 1-4
Network: ABC

Story: Four dozen people survived a plane crash and are lost on an uncharted island in the South Pacific. As the strangers band together for comfort and support, they realise several things are very strange about their new home.

Michael Chiklis, Benito Martinez, CCH Pounder
Seasons: 1-7
Network: FX

Story: Focuses on the tension between a group of corrupt but brutally effective cops & assault team members; the honest detectives caught in the middle who play both sides; and a police captain torn over his job and his ambitions.