. . .I did not mean the actor is unknown or not a star or whatever. I just meant he was unknown to me! Only to me! That is all! . . .
When Original Star Trek aired in the 1960s, it was instrumental in making me more aware of some actors. Guys like William Shatner and Leonard Nimoy, to name two. I had seen Shatner previously in episodes of The Twilight Zone, The Outer Limits, and The Man From U.N.C.L.E., but he really wasn't on my radar at the time. And Nimoy was unknown to me too. The only actors I was aware of at that time were people like John Hoyt (I knew his name from Outer Limits), Paul Fix (from The Rifleman), Gary Lockwood (The Lieutenant), Sally Kellerman (Outer Limits again), and Paul Carr (from Voyage to the Bottom of the Sea). And they were all in the pilots. Shatner, Nimoy, Kelley, etc., were complete unknowns to me back then.
Of course, I was 15 at the time.