As Tsunade hints in episode 322, “Only the name itself is power.” Madara Uchiha is first named in chapter 308 by the Nine-Tailed Fox. It’s only in Chapter 560 – over 200 chapters later – that fans finally see the character in action. He was hailed for being such a powerful being that we were not disappointed when it came time to introduce him.
In Chapter 560, during the Fourth Great Ninja War, Madara enters the battlefield as an undead revival and almost singlehandedly annihilates an entire division of allied shinobi forces, killing hundreds of ninjas by summoning two meteorites to level the battlefield . And when he faces the strongest warriors of the five great nations, he toys with them until he unleashes his true power and exposes them to death.
Aside from being a master of the Sharingan, he also unlocks both his evolution – the Mangekyō Sharingan – and his more powerful evolution – the Eternal Mangekyo Sharingan. This grants him the use of the perfect Susanoo, a titanic avatar that Madara claims can “destroy all things in this universe” in episode 339.
During the climax of the war, Madara absorbs all nine Tailed Beasts and becomes the Ten-Tails Jinchūriki, something only two others had achieved, one of which was the Sage of the Six Paths. At his strongest point in the series, not even Naruto and Sasuke, buffed by the Sage of the Six Paths himself, can’t stop him.