Yes,
Peter denied him 3 times. But what a change there was! It's too long to reproduce, but go to
www.biblegateway.com and look up Acts 2:14-39. Yes, the one who wouldn't even acknowledge Jesus to a servant girl now stands before crowds and even the Sanhedrin declaring that Jesus is the Messiah!
I'm not going to get into the whole Judas issue. I'll just say that Judas' role was prophesied years before he was even born.
Thomas doubted
then placed his fingers in the wounds on his hands and side. He wanted to find the truth. But so many look over Thomas once he was presented with the answers to his questions, they cling to the fact that he doubted. But read on, "Thomas said to him, 'My Lord and my God!'"
Chris