One of the biggest what ifs in the Naruto universe is:
What if Sasuke Uchiha joined Madara Uchiha instead of opposing him during the Fourth Great Ninja War?
Let’s break down how this could’ve changed the entire ninja world — and maybe even doomed it.
Why Would Sasuke Join Madara?
In canon, Sasuke joins the Allied Shinobi Forces after speaking with the reanimated Hokage and deciding to protect the village in his own way. But if that didn’t happen…
Here are possible reasons Sasuke might side with Madara:
Hatred for Konoha still lingers, and Madara appeals to that vengeance.
He sees Madara’s Infinite Tsukuyomi as a real path to peace — even if it’s fake.
He views the shinobi system as broken beyond repair and wants to reset the world.
He’s manipulated by Black Zetsu or tempted by the power of the Rinnegan and Infinite Tsukuyomi.
The Power Duo: Madara & Sasuke
Together, they’d form the most dangerous Uchiha alliance ever. Consider this:
Category
Details
Character
Sasuke Uchiha
Alliance
Madara Uchiha
Outcome
Infinite Tsukuyomi initiated
Rival
Naruto Uzumaki
Final Battle
Hokage Naruto vs Rogue Sasuke
Their synergy would be off the charts. Sasuke could act as the right hand executing Madara’s plans, or even leading a rebel faction against the shinobi alliance.
Imagine their dual Susano’o tearing through Allied Forces.
How the War Changes
Team 7 is shattered
Naruto is devastated. Sakura and Kakashi are emotionally wrecked. Naruto might fight harder, but with far more anger and confusion.
Sasuke battles Naruto sooner
With Sasuke fighting against him in the war, the Naruto vs. Sasuke battle happens on the battlefield, with no time for emotional resolution.
No Sage of Six Paths power for Sasuke
In the original story, Sasuke receives power from Hagoromo after proving his resolve. But as Madara’s ally, he would never be entrusted with it.
Sasuke becomes the new vessel
After Kaguya is revived, Zetsu might try to make Sasuke a backup vessel, or Madara may sacrifice him if he sees Sasuke gaining too much power.
What If They Succeeded?
If Sasuke and Madara pulled off the Infinite Tsukuyomi:
The world would fall into an eternal illusion.
Sasuke might eventually regret it once he sees the cost — especially what happens to Naruto.
Sasuke could even turn against Madara, setting up an internal Uchiha civil war post-victory.
Or…
Madara would absorb Sasuke’s power, betray him, and rule alone — showing that true peace was never part of the deal.
Relationships That Break
Naruto & Sasuke: The ultimate rift. Naruto sees Sasuke as beyond redemption. The final battle becomes not just ideological, but personal and tragic.
Sakura: Left heartbroken and conflicted — would she fight him, or still believe there’s good in him?
Itachi’s Legacy: Sasuke spits on his brother’s sacrifice. The Uchiha name becomes a true symbol of destruction.
Konoha: Might never recover. With two Uchiha nearly destroying the world, the village’s trust in any remaining Uchiha would vanish.
Alternate Timeline Outcome
Scenario
Result
Madara + Sasuke win war
Infinite Tsukuyomi succeeds, world trapped in illusion
Naruto defeats them
Naruto must kill or seal Sasuke permanently
Sasuke betrays Madara later
Sets up a darker version of Sasuke vs. Madara instead of Naruto
Kaguya revives
Neither Madara nor Sasuke control her; she eliminates both
Final Thoughts
If Sasuke joined Madara…
It would be the worst-case scenario for the ninja world.
The war would end faster, but with much greater tragedy.
Sasuke might come to regret it — but only too late.
Naruto’s mission to save his friend would become a doomed dream.
It’s a chilling idea — one that turns Sasuke from a redeemed rival into an endgame villain, possibly even worse than Madara himself.
Want a fanfic outline or alternate ending where Naruto tries to redeem Sasuke in the middle of the Infinite Tsukuyomi world?
Or want visuals of a corrupted, Madara-aligned Sasuke design?
Let me know — we can build that world together.
Related Reading:
What If Naruto Betrayed Konoha?
What If Naruto Sadly Never Existed
What If Naruto Was Cursed with Karma?
