This happens in Naruto Shippuden Season 8.
The lead in was in Episode 156: Surpassing the Master.
The invasion happened in Episode 157: Assault On the Leaf Village!
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The episode where Pain starts to invade and attack Konoha is in Episode 157
~ Naboa-kun
The one that hasn't come out yet? Read the manga! It's like two books from where the episodes are now!
Season 8, Episode 157- Assault on the leaf village.
First shippuden episode
It was a OVA called: Hidden Leaf Village Grand Sports Festival!
Earlier it was stated as Natural disaster but later we came to know that this was planned attack by Madara uchiha
He doesn't come back. He gone crazy and now wants to destroy the village for some random reasons and joined the Akatsuki.