10 Most Underrated TV Actors Of All Time

10. Seth Gilliam

Seth Gilliam is the kind of actor many people recognise, but can't quite name.

Predominately sticking to TV, Gilliam has been acting on the small screen since the early 90s, when he had a recurring role on The Cosby Show. But his big break didn't come until the seminal HBO drama Oz hit screens, a dark and enthralling prison drama that cast Gilliam as prison guard-turned-inmate Clayton Hughes.

He starred on the show for a couple seasons, and made a big enough impression to land himself a role on David Simon's masterful crime drama The Wire, where he served as one of the series' most prolific and important supporting characters, the rogue and complex Sergeant Ellis Carver.

As Carver, Gilliam proved his skills as an actor able to bring striking complexity to seemingly single-minded characters, and he followed up his time of the show with a major recurring role in Teen Wolf - as the mysterious Dr Alan Deaton - and today is probably best known for his turn as Gabriel Stokes in the epic horror series The Walking Dead.

Powerful and commanding, Gilliam has been a prominent TV mainstay for over thirty years, and promises to stick around for a long time to come.