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No. 1 - “Jurassic Bark” (Season 4, Episode 7)
We wouldn’t even think of putting this episode anywhere else but the number one spot. It is just so incredibly heartbreaking. And at the same time, everything leading up to the ending is hilarious. Anyone who is even remotely a dog lover knows what loyal companions they are, but there is no better friend than Fry’s dog, Seymour, as we come to find out in this episode. After learning that Seymour’s petrified remains have been found and put on display in a museum, Fry sets out to have Professor Farnsworth clone the dog so they can be together again. In the end, however, Fry learns that his trusty mutt lived to the ripe old age of 15, which was 12 more years after Fry accidentally froze himself. He decides not to clone Seymour after all, figuring he lived a full life after he was gone, and wouldn’t even remember him. However, via flashback, we learn that Seymour patiently waited in front of the pizzeria where Fry worked for the remainder of his days on Earth for his best friend to come back. The manliest of men (even those who hate dogs) would be hard pressed not to choke up by the time the end credits roll on this one.