"Bill and I are extraordinarily good friends now," Wheaton said. "But I got on the phone with Bill, and he said he wanted me to come on the show and play ... Radloff's book, Wil Wheaton does ...

Then, at 18, Wheaton suddenly left Hollywood. He explains why he left and came back and how he came to play his evil self on The Big Bang Theory. Produced by Will Wei. Camera by Devan Joseph.