Life as a Red Shirt on Star Trek
Check out the
Lt. Leslie archives. One actor, Eddie Paskey, played the same guy in the background of almost the entire first season run of the original Star Trek. If you click on the picture it will take you to Eddie Paskey's home page.
The archives are truly funny.. somebody with far more time than I have has analyzed each frame to see where "Mister Leslie" shows up. Worth a look, it made me chuckle..