he got crushed by the rock, but was then rescued by some uchiha bastard that thought that having a unknown sharingan user could benefit the clan in it's upcoming revolt. they planned to have the kyubi destroy the village and then take over. but things got fucked up and the 4th defeated obito, and the clan didn't stand besides him and left him to supposedly die. again. at this time, he encounters Payne\Negato. he learns of their ideas to use the juubi and decides to shadow them. later on, he conspires with Itachi to kill the uchiha clan, as he still holds a grudge against them for abandoning him in the fight against the 4th.
jump forward, during the timeskip, Obito manages to awaken his m.Sharingan (which awakens the sharingan in Kakashi as well) and he starts to set the bijuu plan in motion, by manipulating Payne.

something else happens then, and we reach the current situation.