Here you will find out what happens during David Tennant’s time as the 10th doctor. David Tennant was the doctor during seasons two, three, and four. He was in a total of 36 very action pact seasons. There are currently nine seasons of the new version of doctor who. Season ten is about to come out on tv. The old version of doctor who was made in 1963. And has an incredible 26 seasons! The production of the old Doctor who lasted until 1989, that’s 26 years.