In which episode did Naruto turn into Eight-Tails Chakra Mode while fighting Pain?


There's an episode in _Naruto_ showing Naruto use the Eight-Tails Chakra Mode
while he's fighting with Pain.

I have looked on Google and nothing came up. The only thing was that when he
met Killer B.

Which episode is this?




I think it's ep. 166 or around that in _Shippuden_.

It started in 166 and the fight started in 167 with Pain vs 8-tails. To be
more precise, the whole ep. 167 was of 8-tails.

