Eye of the Moon Plan

The is Madara Uchiha and Obito Uchiha's ultimate plan that the Allied Shinobi Forces intend to stop during the events of the Fourth Shinobi World War.

The Plan
Under the guise of Tobi, Obito used the Akatsuki to gather the tailed beasts to fuse them back into their original form, the Ten-Tails, through the Demonic Statue of the Outer Path. Then, once absorbing the Ten-Tails and becoming a jinchūriki with god-like powers, Obito would project his Mangekyō Sharingan on to the moon, the prison of the Ten-Tails' body, to cover the world in an. The end result of the plan being that he would control every living being, ending all conflict by purging free will itself. However, during the attack on Konoha, Obito's statement of "starting a war to bring peace" is part of his ideal that the end result justifies the means. Ultimately, Obito intends to execute the plan over his former team-mate Kakashi Hatake failing to prevent Rin from dying, leading Obito to hate the reality they live in.

Though Tobi obtained seven of the nine tailed beasts, only the final two Tailed Beasts, Gyūki and Kurama, remained beyond his grasp. After Taka and Pain failed to capture the two Tailed Beasts, through Sasuke managed to bring him a part of Gyūki's tentacle, Obito decides to discard all caution and reveal himself while using the name of Madara to commence with this plan. Prior to revealing himself to the Kage at the Kage Summit in the Land of Iron, Tobi has Zetsu lure them to Sasuke Uchiha and his team in hopes the ninja leaders would be weakened enough to be easily taken hostage to negotiate their freedom in exchange for the last two living jinchūriki, Killer B and Naruto Uzumaki. This, however, ended in failure, due to Danzō Shimura escaping during the chaos while combined forces of the Kage, their bodyguards, and Mifune overwhelmed Sasuke. Sending Sasuke into the other dimension with Karin, Tobi introduces himself as Madara while revealing this plan to the four five Kage. However, they refuse to hand over Killer B and Naruto while forming the Allied Shinobi Forces to prevent Tobi from going through with his Eye of the Moon Plan.

At the end of the first day of the Fourth Shinobi World War, Tobi took the Kohaku no Jōhei and Benihisago that each contained one of the Gold and Silver Brothers, and having already collected a portion of the Eight-Tails from the tentacle Sasuke captured, Tobi intends to put the plan into motion by the end of the following day. Later, while fighting Naruto, he had the Demonic Statue of the Outer Path swallow the Kohaku no Jōhei and Benihisago in order to revive an incomplete Ten-Tails, claiming that the monster would still have enough power to be sufficient in completing his plan.

Trivia

 * Tobi has blamed Naruto for the plan's slow progress, due to his constant interference.
 * Tobi noted that he would eventually sync Sasuke Uchiha with the statue. However, currently whether that is to simply add another person to the depleted Akatsuki extraction team, or something grander, is currently unknown.