Here's a list of the voices James Doohan did in TAS (according to the "Memory Alpha" website)
Lt. Arex
Kyle
Sciences division officer
Ancient insectoid
Magnetic organism
Aleek-Om
Bates
Lt. Erikson
Guardian of Forever
Thelin
Vulcan healer
Robert Wesley
Lt. Carver
Koloth
Gabler
Romulan Commander
Agmar
Stavos Keniclius 5
Lucien
White rabbit
Master Computer (Shore Leave Planet)
Male Ursinoid miner
Human miner
Mendant of the Terratins
Bell
Clayton
Kaz
Kor
Xerius
Clayton
Cadmar
Domar
Lemus
Aquan male
Chuft Captain
Kzinti telepath
Tom Markel
Sord
Tchar
O'Shea
Orion captain
Orion ensign
USS Enterprise transporter chief (Pirates of Orion)
Bem
Search party crewman (Practical Joker)
Kol-tai
Dramian Supreme Prefect
Kukulkan
Dawson Walking Bear
Robert April
Karl Four
There's one serious omission from that list...
Montgomery Scott
Robert April was in his 80s in that episode..
James Doohan(in german accent): I am actually Vulcan, Ensign JohnA.Lang!
RE: ScottN: Yeah...but I figured that one was kinda obvious. However, you were right. I should have entered "Scotty" anyway. Thanks for keeping me on my toes.
in Pretty Maids all in a Row, James Doohan played an American sounding voice!