In no particular order:
The Fugitive
The Avengers
WKRP in Cincinnati
The Wild, Wild West
The Addams Family
Leave It to Beaver
Rawhide
The Twilight Zone (original)
The Outer Limits (original)
Monty Python's Flying Circus
Runners-up:
T.H.E. Cat
Maverick
Columbo (original 1970s run)
Jonny Quest...