If not David Tennant as the Tenth Doctor in 'Doctor Who,' then who? Honestly, I have no idea, but I'm glad we never had to find out.

"About 48 hours after they asked me, I sort of had to process everything that it meant," Tennant recalled. "And I had an agent at the time that was like, 'Don't touch it. It's not

As revealed during a special episode of David Tennant Does a Podcast With… (this time led by wife and one-time Doctor Who co-star Georgia Tennant), he mulled over the decision to play the Tenth Doctor – even if it was obvious to others that he was about to go whizzing across time and space.