Hey! That's cheating! We have to try and figure it out on our own! It's so much more fun that way.
Although... It's kind of interesting...
These are the ones with four or more appearances:
Bill Dyer... Engineer / ... (9 episodes, 1983-1986)
Jack Ging ... General Harlan 'Bull' Fulbright / ... (8 episodes, 1983-1986)
Judith Ledford ... Carla (7 episodes, 1986)
Tony Ciccone ... Parking Attendant / ... (5 episodes, 1983-1986)
Mills Watson ... Stryker / ... (4 episodes, 1983-1987)
Ismael 'East' Carlo ... Alvarez / ... (4 episodes, 1983-1985)
Red West ... Lt. Trask / ... (4 episodes, 1983-1986)
Danny Wells ... Film Director / ... (4 episodes, 1983-1984)
Jim Boeke... Bill Mather / ... (4 episodes, 1983-1986)
Rod Stryker... Sgt. Case (4 episodes, 1985-1986)
Jack Verbois ... Flint / ... (4 episodes, 1983-1986)
John Carter ... Fake Hannibal Smith / ... (4 episodes, 1983-1986)\
So Bill Dyer wins...
1.A Nice Place to Visit (10 May 1983) - Minister (as William Dyer)
2.When You Comin' Back, Range Rider?: Part 1 (25 October 1983) - Engineer
3.When You Comin' Back, Range Rider?: Part 2 (25 October 1983) - Engineer
4.The Island (13 November 1984) - Old Man Villager (as William Dyer)
5.The Big Squeeze (15 January 1985) - Claude (as William Dyer)
6.The Road to Hope (29 October 1985) - Wino #2 (as William Dyer)
7.Waiting for Insane Wayne (18 February 1986) - Reverend
8.Firing Line (10 October 1986) - Father Stellini
9.The Spy Who Mugged Me (12 December 1986) - Douglas