Featuring animations by Terry Gilliam and including such sketches as the "Spanish Inquisition" and "Lumberjack Song", this is, FTP, what 1969-1974 British comedy program?
This show was initially capped at thirteen episodes, but managed to run for four seasons.  Its cast members had previously been on such shows as At Last the 1948 Show and Do Not Adjust Your Set, and two episodes of this show were produced in German.  Time Magazine claimed that this show "made erudition cool" with such episodes as "Man's Crisis of Identity in the Latter Half of the Twentieth Century" and "The All-England Summarize Proust Competition". Featuring animations by Terry Gilliam and including such sketches as the "Spanish Inquisition" and "Lumberjack Song", this is, FTP, what 1969-1974 British comedy program?
This show was initially capped at thirteen episodes, but managed to run for four seasons.  
Monty Python’s {Flying Circus} (prompt on “Monty Python”)