Technically, Sasuke and Sakura (and everyone in the leaf village) already knew about the nine tails back in episode 1. Only the adults knew it was Naruto.
It isn't known
I would say: Akatsuki Sasuke [sometimes] the Nine-Tailed Fox
Because sasuke,itachi and madara is uchiha clan members.Actuly it was because Madara knew that Itachi would die sooner or later, and he knew Sasuke would come back for revinge agnsed Itachi. Madara, being the awsome lier he is, he lied to Sasuke, to get the gult from Sasuke to Madara, so Madara is using Sasuke to get the eight-tailed beast and the nine-tailed beast, and the nine-tailed beast would be simi dificult, but Madara problye has a plan allready (And knowing him, he douse)madara wanted to show the power of uchiha clan using sasuke
I think that it is the episode when sasuke and naruto fight haku and sasuke is on the edge of death and narutos emotions take over him. And no that is not in shippuden.
Technically, Sasuke and Sakura (and everyone in the leaf village) already knew about the nine tails back in episode 1. Only the adults knew it was Naruto.
Not until episode 52 when they meet again in Naruto Shippuden.
to get cursed mark sasuke get 500 to get nine tailed fox get 1000
if u want to get nine tailed naruto in broken bond u have to beat cursed sasuke at the end of the game and u will get cursed sasuke and nine tailed naruto.
It isn't known
The truth is that sasuke is, in the old series sasuke won, and in naruto shippuden sasuke still wins, it might be that the sharigan can have a control on the Nine tail fox
I think sasuke is stronger than the nine tails
I would say: Akatsuki Sasuke [sometimes] the Nine-Tailed Fox
he knows now bcuz wen they were fighting on the water sasuke saw the fire and the nine tails and naruto was running like a fox ^^While Sasuke does see that, he doesn't find out that the 'power' Naruto has is coming from the Nine-Tails. He doesn't find that out until Shippuden episode 52 i think, when they find Sasuke at Orochimaru's hideout, and Sasuke uses his sharingan to see into Naruto.
Only Sasuke has seen the full form of the fox of all of Naruto's friends. And that's during their battle, and on the first episode of Shippuuden.
Episode 1 shipunden and 51 shipunden
Even with the power of the Nine-Tailed Fox, Naruto can't beat Sasuke because Sasuke is stronger than Naruto from the start. At the Final Valley, Naruto couldn't beat Sasuke even with the one-tailed transformation. In part two, Sasuke have managed to become one of the Uchiha clan who can really control the real power of the Sharingan. Even the Nine-tailed Fox admitted that Sasuke's chakra is more ominous than its own and he was like Madara Uchiha.