#20 Colm Meaney
Star Trek series: Star Trek: The Next Generation, Star Trek: Deep Space Nine
Character name: Miles O’Brien
Meaney debuted the role of O’Brien in The Next Generation and continued to play the role in Deep Space Nine. O’Brien served as transporter chief aboard the USS Enterprise-D for several years before being promoted to chief of operations aboard Deep Space 9. Meaney appeared in 52 episodes of The Next Generation and in 173 episodes of Deep Space Nine. Among all the Star Trek actors, Meaney is the cast member to have appeared in the pilots and final episodes of both series.
Post-Star Trek, the Irish actor appeared in a lot of movies, including the Daniel Craig-led crim film Layer Cake (2004), sports drama The Damned United (2009), comedy Get Him to the Greek (2010), and the Nicholas Hoult-fronted biographical drama Tolkien (2019). He was also one of the main cast members of AMC’s western period drama Hell on Wheels, in which he played the role of Thomas “Doc” Durant from 2011 to 2016.