http://tvtropes.org/pmwiki/pmwiki.php/Main/GoBackToTheSource

6, 9 "Go back! To the first room! He'll show you... the Source!"

A situation in which a character (usually the MacGuffin of the plotline) must return to the place where they or an important plot device originated from. This can involve taking the character back to where they came from, or going to the literal source of something, such as the place where an object of power was created..

Related to Now Do It Again Backwards (Wanna destroy something? Then go back to where it was created), Bookends, and It Was with You All Along. If it involves time travel, then it could be Back to the Early Installment. Also could be a supertrope to Where It All Began.

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Examples:

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Anime/Manga

Fan Works

This trope is a necessary to become a true Concept in the Pony POV Series. While not necessary to becoming an Alicorn, taking the next step requires returning to Fauna Luster, the Mother of All Things. Fauna Luster's title is Not Hyperbole: she's literally the mother of every living thing that exists as all souls come from her. It's unknown if Draconequi works the same way as mortals ascending to become them are nigh nonexistent.

Film — Animated

The film 9, the Trope Namer, involves 9 needing to go back to the room where he and the other stitchpunks were created in order to stop the Fabrication Machine. The talisman that allowed them to be created is most commonly termed "the Source" by the fanbase, as it did transfer the stitchpunks' souls into their bodies. Though in the movie, 6 was implied to actually be referring to the scientist who used the talisman to create them...

Ice Age: Manny, Sid, and Diego must take the baby Rosham back to his village.

Moses in The Prince of Egypt must return to Egypt in order to free his people.

The Lion King (1994): Simba returns to his home of Pride Rock in order to dethrone Scar and claim his place as king.

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Film — Live Action

Literature

Haroun and the Sea of Stories: Haroun and his friends on the moon of Kahani must go to the place in the Sea of Stories where all the stories originate, in order to stop Khattam-Shud from plugging it and corrupting all the stories with his "anti-stories". This part of the Sea of Stories, the Wellspring, is also appropriately called "the Source".

At the end of Harry Potter and the Half-Blood Prince, Harry invokes this trope outright: "I thought I might go back to Godric's Hollow... For me, it started there, all of it. I've just got a feeling I need to go there." In the next book, Hermione proposes an actual reason for going there. All is ultimately subverted when nothing beneficial happens there. They don't find any of the unknown horcruxes, they don't find any information on the Deathly Hallows, Harry is nearly killed by Voldemort's snake, his wand is broken when he's rescued, and he later laments that he didn't even get a chance to kill the snake while he was at it (the snake being a horcrux).

The Lord of the Rings: Frodo must take the One Ring to its place of creation, Mount Doom in the land of Mordor, in order to destroy it and rid the world of its evil power.

The Aeneid: Aeneas and his crew set sail to Italy, which the gods inform them is where the Trojan race originated.

Live-Action TV

In the series finale of Lost, Desmond - and later, Jack - return to the cave that was first seen in the earliest part of the series timeline. Inside is the source of life, death and rebirth; fans quickly dubbed it "the Source." This is probably directly inspired by Haroun and the Sea of Stories (above), Desmond was reading while sitting next to Jack on the plane in the season premiere. The site also happens to be right next to the bamboo grove where the series's first scene took place.

Two for one in Star Trek: The Next Generation S4E5 "Remember Me": to retrieve the missing Dr Crusher the Enterprise has to return to the point in space where she disappeared, while Dr Crusher in her alternate reality has to return to Engineering, where her trouble began.

Theatre

In The Ring of the Nibelung, the cursed Ring has to be returned to the Rhine, from where the gold was stolen.

Video Games

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Web Original

In The Gamer's Alliance, Khasra III enters the cursed celestial city of Xar Daeon to purify it from the taint of darkness, which helps him weaken demons' regenerative powers because the city's powers were directly linked to demons. The heroes of the Grand Alliance are given the task of locating the source of the Blood Fever in order to purify the source and thus put an end to the spread of the deadly fever.

That Guy with the Glasses: In Suburban Knights, Malachite's Hand is hidden in the same place the quest started from .

. In Homestuck, John goes back in time to various events in Terezi's life in order to fix the timeline.

Western Animation

Real Life