i can’t remember the exact episode number
but the first time is during the fight with saskue when he is trying to leave the village and naruto finally catches up to him
The Episodes that I Recall Seeing “red” :
16 : Original Release of 9 tails Chakra
63 : During The Chuunin Exam against Neiji
79 : When he Goes “red” to defeat Gaara
132-134 : Naruto vs. Sasuke’s Fight at the “Hero’s WaterFalls”
i can’t remember the exact episode number
but the first time is during the fight with saskue when he is trying to leave the village and naruto finally catches up to him
The Episodes that I Recall Seeing “red” :
16 : Original Release of 9 tails Chakra
63 : During The Chuunin Exam against Neiji
79 : When he Goes “red” to defeat Gaara
132-134 : Naruto vs. Sasuke’s Fight at the “Hero’s WaterFalls”
naruto 134 ,naruto shippuden 50 or 45 or something in between