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let's give this a shot. *deep breath*. Episode 21 (First appearance) Episode 34 (Forest of Death) Episode 48-50 (Gaara vs Rock Lee) Episode 58 (Hospital) Episode 65-67 (Gaara vs Sasuke) Episode 74-75 (Gaara vs Sasuke cont.)
In the manga, Sasuke goes back to the Leaf(for his important 'work') in chapter 618.He decides to join Konoha in the war in chapter 627.And in chapter 631, he declares his wish of becoming the Hokage. Since he's still fighting alongside Naruto in the war, he hasn't completely 'returned' to the Leaf yet~.