Poll of the Week: What was your favorite TOS actor appearance?

There are an enormous number of inter-series cameos in Star Trek, and more often than not, they’re delightful treats, designed to connect and further flesh out a universe so massive it might otherwise become tangled and unfollowable.
Quark and William Riker have enjoyed a number of these appearances, but for this particular poll, we’ll be focusing on those moments where characters from The Original Series were featured in later shows. Dr. Leonard McCoy’s tour of the Enterprise-D is the first of these shown in the pilot episode for TNG, later followed by Ambassador Spock and his attempts to reunite the Romulan people with their Vulcan brothers in “Unification Parts I and II.” The discovery of Montgomery Scott’s shuttle on the Jenolan Dyson Sphere was the focus of the TNG episode “Relics.” Sarek (featured in the aforementioned episode, shortly after appearing as a titular character in the previous season of TNG) helped to connect the old to the new, and to pass on a well-known legacy. Finally, in one of the most popular episodes of Voyager, Hikaru Sulu and Janice Rand, shown in a memory as the captain of the Excelsior, provide excellent background information into Tuvok’s past, while adding some much need variety to the show’s stories.
So which of these appearances was your favorite? Did we catch all the top appearances, or did we miss one?
Head to the forums now to register your vote in the poll. Be sure to add a comment after you vote!