Shilliam Watner
Commander
Interesting:
Lt Harrison (Ron Veto) appeared in 27 episodes of the original series compared to Lt Kyle (John Winston) who appeared in 11.
...by the way, the sources of information I saw (memory-alpha and IMDB) says that Veto was in 13 episodes, not 27.
http://en.memory-alpha.org/wiki/Ron_Veto
Ron Veto

Appearances
This list contains 27 items
- TOS: (27)
- "The Corbomite Maneuver"
- "Mudd's Women"
- "The Enemy Within" (scene deleted)
- "The Naked Time"
- "Charlie X"
- "Balance of Terror"
- "The Conscience of the King"
- "The Galileo Seven"
- "The Menagerie, Part II"
- "Shore Leave"
- "Arena"
- "The Alternative Factor"
- "The Return of the Archons"
- "A Taste of Armageddon"
- "Space Seed"
- "This Side of Paradise"
- "The Devil in the Dark"
- "Errand of Mercy" (also as an Organian villager)
- "The City on the Edge of Forever" (stock footage only)
- "Operation -- Annihilate!"
- "Metamorphosis" (stock footage only)
- "The Omega Glory" (stock footage only)
- "Elaan of Troyius" (stock footage only)
- "And the Children Shall Lead" (stock footage only)
- "Spock's Brain" (stock footage only)
- "The Cloud Minders" (stock footage only)
- "Turnabout Intruder" (stock footage only)