Miles O’Brien – Colm Meaney
Irish actor Colm Meaney first appearance was in the 1987 pilot episode, “Encounter at Farpoint”, of Star Trek: The Next Generation – his role? Unnamed helm officer. However it didn’t take long for his character to become a recurring one – ergo, Miles O’Brien, the Transporter Chief, was born. But in 1993, Meaney left to pursue a much more prominent regular role in the spin-off Star Trek: Deep Space Nine, which is where he remained until its final episode in 1999. No doubt you know that he has since gone on to gain a significant motion picture career.
Q – John De Lancie
Sassy “Q” was portrayed by none other than John De Lancie. Likewise we should note that “Q” is just one of few character to appear in multiple series of the franchise. Additionally aside from Star Trek, he has landed many television series roles and even has a good film and theatre presence. As if he couldn’t get more perfect, he’s also a published author.