Yes, in the Kakashi Chronicles arc in Shippuden. Check out Naruto.com.
Madara NEVER turned into Obito. Madara was under the disguise 'Tobi' for alot of the past episodes but after Deidara's death, he revealed himself to be the imortal Madara Uchiha. Obito was crushed under a rock when on a mission with Rin and Kakashi around 13 years of age.
no obito is obito
Yes, Obito is evil. It was revealed in the Manga that Tobi was Obito.
no it is rumered that Tobi is madara uchiha in obito's body but no pein is not obito
Obito
An appearer is a person who appears or who makes an appearance.
Technically Obito lost his fight against the fourth, Obito managed to force 4th to flee with Naruto, but during their later struggle 4th defeats Obito buy teleporting to a kunai behind Obito
Obito has to have some kind of relationship with Madara. how does Tobi/Obito know so much about madara..
Because Tobi is from First hokage generation and Obito was from Kakashi generation.
Obito was found by Madara Uchiha but after a while Zetsu told Obito that Kakashi and Rin were in trouble. Obito's body was weak so Tobi let Obito where his body and Obito saw weird things in his left eye and when he got there he saw Kakashi kill Rin and so Kakashi and Obito both unlocked the mankegyou sharingan.
Tobi isn't Obito. He is Madara Uchiha
Obito dies in the series Naruto