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"London" (Season 6, episode 1 & 2)
So much happens in this two-part episode that was created largely to keep Pratt in the show while he was off shooting "Guardians Of The Galaxy." The explanation for Andy's suddenly movie-star-superhero-ready physique is hilarious ("I just stopped drinking beer"), as is the guest appearance by the great Peter Serafinowicz, who plays an English upper-crust version of Andy. Ron's sudden wedding is pretty wonderful, especially because of how much it frustrates Leslie, and Tom's face-to-face encounter with Dr. Saperstein (Henry Winkler) explains quite a bit about Jean-Ralphio and Mona-Lisa ("Your daughter need to be put in a mental institution. On an island. In space.") and their blatant pathologies. Still, though, what I remember first about this is one of the finest examples ever of just how well Leslie knows her friends. If you can make it through the entire beautiful final sequence of Ron following her directions for a special detour in Scotland without spilling tears, you are made of stronger stuff than I. Every single time, I am struck by the pure thousand-watt joy that Ron radiates in those moments. This is the kind of emotional payoff that only television and its long-term relationship with characters can offer to us as viewers.