He wants to gain more power to kill his brother Itachi Uchiha. When Orochimaru gave him the curse mark he knew it would make him want his power and force him to pursue him. To make it easier he sent the Sound Four to escort him to his lair.
No sasuke will not defeat orouchimaru naruto will sasuke is on orouchimaru's side he isn't against him
he goes to his side to get power to kill itatchi
yes his still in the dark side because he want to kill his brother
yes Sasuke does return to the side of the leaf meaning he is once again a good person .But he does not return to the hidden village of the leaf.
Pull over to the side of the road, emergency and police vehicles have right-of-way.
Well it really hard to say if naruto will beat sasuke we not know yet they haven't really fighted in shippudnen. Now sasuke coming to the leaf village because he knows why Itachi killed his clan the truth so we not know who will win really until the episode put on magna. I think Sasuke will win because he was training more then naruto and nothing fears him and he has Itachi eyes that what I think what do you think.Sorry to say this but I believe Naruto is going to win, cause Naruto has the will power and a pure enough heart, while Sasuke is still lingering on the side of darkness,destruction and rage. Sasuke's heart was tainted and his hands bathed in blood. Though Naruto still believes in fighting for Sasuke and knock him back into his senses. For Sakura, Himself, and for all of the leaf.
Sasuke is from the Uchiha clan which was exterminated by his elder brother, Itachi, who he despises for it. Sasuke is from the team led by Kakashi sensai. His heart is dark and Orochimaru and his pawns have been planning to lure him over to their side for an anxious, extended time. Sasuke wants revenge against Itachi and soon he betrays his friends to kill him. Sasuke's moves include his Fire style attacks, his new Shishirendan, which he copied from Rock Lee's taijutsu, and his most powerful move, the Chidori, a Lightning Blade he learned from Kakashi sensai. His taijutsu is unbelievable too, so Sasuke is a worthy opponent. Sasuke has a strict rivalry between Naruto, because Naruto always saves him and this means Sasuke is weaker than him. Sasuke's original move the Sharingan, can allow him to imitate any jutsu for a limited amount of time until his chakra runs low.
episode 133 is when one tailed fox naruto fights cursed seal stage 2 sasuke
She still has feelings for Sasuke because of the bench scene in Part 1. "Sasuke" was being nice to her and complimented the one thing she hated about herself(her forehead.) She thought he had a nice side and might have feelings for her but in reality that was Naruto that transformed as Sasuke. Other than that, I can't think of a logical reason.
In manga...YES! He wasn't bad with Orochimaru because he was only fulfilling his ambition to kill his brother Itachi. After Itachi died because of over-using Mangekyou Sharingan. Sasuke decided to defeat Orochimaru. Whist with Orochimaru Sasuke formed the group Team Snake. Team Snake contained Suigetsu Hozuki, Karin, Jugo and Sasuke.Team Snake's focal mission was to kill Itachi. Now Itachi and Orochimaru are dead. Sasuke turned to Akatsuki which had Madara Uchiha. Then Sasuke decided Team Snake was now called Team Hawk. Team Hawk with Akatsuki now plan to destroy Konaha, but Sasuke only plans on killing the elders. Sasuke killed Orochimaru to save all Orochimaru's captives. At the moment Sasuke is on the bad side; but he still has a heart!
They never fought each other and are on the same side. Madara is still alive.
It is yet undetermined. However, it isn't quite right to call Sasuke "good" or "bad". If you mean back on Konoha's side, that's yet unknown.