Since several are talking about it in the Cool Craaap thread in OT and I agree that it’d be a fun arc.
Monty Python and the Holy Grail
Life of Brian
Meaning of Life
Plus Terry Gilliam’s Brazil 
I’m down with MP.
I enjoy them all, but boy do I love Holy Grail 
And in all deference to those who aren’t the biggest fan of the Python (hey, I don’t like The Office - I still think it’d be a great arc, as Python references are all over the place
Perhaps a combined MP and Terry Gilliam arc?
Holy Grail
Life Of Brian
Meaning Of Life
Time Bandits
Brazil
Adventures Of Baron Munchausen (c’mon Uma Thurman nekkid as Venus on her 18th Birthday?)
12 Monkeys