SPOILER SPOILER SPOILER!!!!!!!!! Is Tobi really Obito?

I heard that Madara saved Obito before he really died. Then he wanted Obito to work with him but Obito said he'd rather go back to the leaf village. But later Obito saw Rin die and then he was angry at the leaf village and wanted revenge and Madara was going to die so he took some of Obito's life. Is this true? *nervous laughter* No, i don't look up spoilers!!! Oh, and could you please tell me which episode you found out the truth?