[MENTION=4071]BeoTeK[/MENTION] It's the prequel to Fate/UBW so many of the characters feature in both but, it add's a lot more understanding as to why masters and servants have been paired the way they are in UBW.
So the next installment I watch should be Fate/Zero 2nd Season and then Fate/UBW ?
These are perfect because they aren't long and drawn out like Naruto and Bleach etc. I much prefer a shorter series. Or even movies?