The 'Finally, I Have Them All' meme originates from the Season 1 finale of the Disney XD animated series Gravity Falls, titled 'Gideon Rises.' In the scene, the character Grunkle Stan brings together three mysterious journals that, when combined, reveal a powerful secret. The meme gained significant traction on platforms like Reddit and Twitter as a way to celebrate completing a set, whether it is a video game trilogy, a collection of rare items, or a trio of related concepts. It perfectly captures the feeling of triumphant satisfaction that comes with finding the final missing piece of a puzzle or finishing a long-term collection.