The World War Z star auditioned for the highly coveted job in secret at the home of executive producer Steven Moffat, and he felt terrible keeping the news from his young daughter Cecily as she longed to see her father as the Time Lord.
Speaking on Bbc special Doctor Who Live, he said, "It's so wonderful not to keep the secret any longer. For a while I couldn't tell my daughter and she was looking at people linked to the show and was getting rather upset that nobody was mentioning me. I just had to say, 'Rise above it, darling'."
Capaldi discovered he had won the part while filming in Prague, Czech Republic but missed the important call as his cell phone was on silent, adding, "It was my dear agent, I returned the call and she said 'Hello Doctor' and I just laughed. And I haven't stopped laughing since."
Capaldi will take over as the 12th Time Lord on the popular British Tv series after current Doctor Who Matt Smith steps down following the upcoming Christmas special.