John de Lancie
From Tardis Wiki, the free Doctor Who reference
John de Lancie (born 20 March 1948[1]) played Allen Shapiro in the Torchwood stories End of the Road, The Gathering and The Blood Line.
He is probably best known for his recurring role as Q in Star Trek: The Next Generation, Star Trek: Deep Space Nine and Star Trek: Voyager from 1987 to 2001. He is also known for voicing the Q-like Discord in My Little Pony: Friendship is Magic from 2011 onwards.