Goliath choosing to join his clan in the curse even though, at the time, the chances of the curse being broken look impossible.
Goliath: Cast your spell... one last time.
Going all the way back to the premiere, the clan re-awaken in Manhattan:
Goliath: You're awake! YOU'RE ALIVE! We're together again!
Near the end of "Reawakening" after Demona and Xanatos have filled the resurrected Coldstone with lies, blaming Goliath for the deaths of the entire clan. Coldstone had gone on a city-wide rampage and tries to kill his own brother. When the pair fall of the bridge their battling on into the water below, it seems like Goliath is finished. But as he looks into his rookery-brother's dimming eyes, Coldstone remembers a maxim that he was taught alongside Goliath.
Hudson: A Gargoyle can no more stop protecting the castle than breathing the air...
Needing no further convincing, Coldstone does the right thing and saves Goliath's life.
A minor note, Xanatos watches the clan quietly as they regroup and doesn't interfere. Almost as if he respects family enough to leave them all be in their moment of reconciliation.
Goliath and Elisa dancing in "Eye of the Beholder." It's just too sweet for words.
Lexington: (as he Brooklyn and Broadway watch Goliath and Elisa with approval) They should have Halloween more often.
In "Eye of the Beholder" when it becomes apparent that Xanatos was really trying to save Fox and not simply retrieve the Eye of Odin.
When Goliath helps Elisa back to her feet and the pair hold hands and smile while Goliath is still (temporarily) human in "The Mirror".
A blink-and-you'll-miss-it moment from The Price. All of the clan, except Goliath, end up stranded on a roof at the mercy of Macbeth (or so they think), who is on a hovercycle and has a laser gun. There is no way they can escape without getting shot. Hudson jumps in front of the trio and flares out his wings, blocking them from view and making himself a bigger target, fully willing to die if it means the rest of his clan has a chance of survival.
The end of the episode "The Cage": Elisa takes Derek to see their parents, whose shock at his mutated state lasts about a few seconds before they rush over and tearfully embrace him. Following up from the massive Downer Ending of "Metamorphosis", it's VERY pleasing to watch.
And Goliath is outside the window, watching this with a contented smile on his face. Consider that even though his own family was destroyed (all of his rookery brothers and sisters are dead), he's pleased that Elisa's was able to come back together damaged but still whole, and for now that's enough.
A lot of pieces in a series this long, but of particular note:
Princess Katherine: He'll hunt us to the ends of the earth!
Magus: *gentle/sincere smile* Then I'll take you beyond them. (and he does)
Goliath reconciling with the Magus on Avalon:
Magus: I cursed your clan.
Goliath:You saved our children.
The ending of Bronx spotlight episode "The Hound of Ulster".
Bronx: (looking as proud as ever)
Elisa: (with a smile) Don't look so smug Bronx.
Goliath: Bronx has a right to feel proud of himself. It's not everyday a land gets one of it's old heroes back, and a land with a hero soon finds other deeds for him to do.
The end of "Mark Of The Panther" also.
Goliath: Your quick thinking helped us defeat Anansi. I am proud of you, my daughter.
Angela: Oh, father! (hugs Goliath right before they turn to stone)
Leo, Una, and Griff's reunion at the end of "M.I.A.".
By the end of "Walkabout" not only has Dingo reformed (for real this time) it's he who manages to talk down the newly sentient Matrix. Afterwards the Matrix decides to join forces with the reformed criminal as a superhero team themselves. Proving that sometimes, A. I.Isn'ta Crapshoot.
Baby Alex playing on the floor with Bronx and gleefully calling him "Doggie!" while Lex and Fox awkwardly make up because they have something in common: they both care about Alex.
Rather subtle, but learning that Xanatos chose Owen over one wish from Puck speaks a lot about the relationship of these two.
The ending speech in A Lighthouse In The Sea Of Time is heartwarming for anyone who loves books. In fact, the whole episode is. If you aren't that big a book lover, Robbins having an epiphany and being able to write again counts too.
I'll admit even I don't consider much of the Goliath Chronicles canon. But I always liked the ending of that seasons final episode. Goliath's final narration was by far the best.
Goliath: One thousand years ago, we lived in a world that understood our purpose. It was the age of Gargoyles. Ten centuries later, we awoke to a world bent on our destruction. Somehow, we never lost hope, and today, we have come full circle. A new age has begun, and we live again.
Many may disagree with me, but for that quote alone, I consider that episode canon.
Personally, I liked seeing Xanatos total one-eighty in personality. His bribing several construction workers employed by Castaway to modify a trap designed to kill the clan, and suggesting to Goliath that they make a clean start elsewhere is not only heartwarming. It's still totally in character for him. Even after a Heel-Face Turn, he hasn't lost the edge.
There is something in that episode that this troper really liked. Throughout the Goliath Chronicles (and part of the comics as well), the Quarrymen are very much active and many New Yorkers are supportive of their desire to hunt the gargoyles down, but in this episode, we see a group of people decide to form their own little organization who are the complete opposite of the Quarrymen, namely that they are not scared of the gargoyles, instead they believe that humans and gargoyles could coexist peacefully. After the Quarrymen thrash their meeting and send a few of the people to the hospital, it's very heart warming to see how happy the founders of the group are when Angela drops by their hospital room to meet them and thank them for their support and kindness.
The Episode "A Bronx Tale" gave the often neglected Gargoyle-hound a chance to shine. He and that little Amish child were just so adorable.
Lexington's (facial) reaction to finding out that Amp is single. He's so happy....
A meta example. In June of 2013, Season 2 Part 2 was finally made available on DVD to Disney Movie Club members, with a general public release in August the same year. For all us avid collectors, finally having our dear friends completely together has been a long time coming.
Out of canon, this one is from Greg Weisman. After a recording session, the crew went to ask Nichelle Nichols' autograph. She in turn ask for their autographs, having been impressed by the quality of writing and production values of the show. This double as a Crowning Moment Of Awesome.