He has appeared in three of the Star Trek series and, along with Jeffrey Combs, Vaughn Armstrong, J. G. Hertzler and Randy Oglesby, is one of only five actors to portray as many as seven characters.
He briefly appeared as blackjack player Borsalino Cap in "The Contingency", the second-season premiere of the TV series Person of Interest.
In 2017, Kopache appeared on the HBO show Last Week Tonight as the "Catheter Cowboy", a character based on a commercial that aired on networks such as Fox News.
[2][3] Kopache's character would star in a similar-looking commercial and initially appear to talk about pain involving catheter use, but would then explain subjects such as the nuclear triad and the problems the American Health Care Act of 2017 offered.
John Oliver bought commercial airtime in the Washington D.C. area and aired Kopache's segment live on stations such as Morning Joe and Fox & Friends[4] in an attempt to send a message to President Donald Trump, as he was aware that Trump watched these shows.