episode 115
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Itachi removed it and killed Orochimaru during his fight with sasuke.
at episode 136 shippuden sasuke first got in the fight with itachi. by episode 139 the fight was over. he won because his chakra overbeat itachi's. itachi used susano'o and ameterasu but sasuke summoned orochimaru. In the end. (Spoiler) Sasuke later learns the uchiha secret. He learns his brother wants to die in the fight/.
that episode does not exist
in manga
episode 203