Yesterday was the fortieth anniversary of the broadcast of The Hand Of God. It's the finale of the original Battlestar Galactica and for my money the best episode of the series.
This is the episode that sees Galactica stop fleeing and fight back against the Cylons. This is the episode that sees Galactica apparently arrive at or near its final destination. This is the episode that best bridges the gap between this series and the twenty-first century reimagining.