Capaldi revealed that he once turned down the chance to audition for the role of the Eighth Doctor in the 1996 TV Movie, a part which instead went to Paul McGann:
"I loved the show so much that I didn’t want to have anything to do with it, unless it was me. I didn't want the disappointment of going for something that I would never get."
Additionally, Michelle Gomez discussed her experience of being cast as Missy, and the big reveal of the character in Dark Water:
"When my agent called to say that I would be taking on this role, I couldn't quite get my head around it. I thought, being the first female Master is up there with being Hilary Clinton running for female president! It's that big in my household."
More clips from the Series 8 DVD launch are expected to be released soon, so stay tuned!
[Source: Doctor Who News]