Does it feel that way to anyone else? Despite the fact that Tennant's run lasted only 3 episodes longer than Smith's (5 episodes if you count Tennant's 2 animated specials), it feels like Tennant was the Doctor for way longer than Smith has been. Why is that? I've got 3 theories: 1.) The numbers game: From the perspective of sheer percentages, when Tennant left the show, he had been the Doctor for 3 out of 4 seasons, certainly the vast majority of the new series up to that time. OTOH, Smith has only been the Doctor for 3 out of 7 seasons, less than half of the series. 2.) Prevalence of early material and shorter gaps between episodes: Basically, that's my fancy-ish way of saying that Tennant did 3 solid seasons for 3 years in a row and didn't start taking breaks until after that. On the other hand, Smith kept us waiting forever between his 2nd & 3rd seasons, and again between his 3rd season and his remaining specials. The longest gap between Tennant episodes was 6 months between "Planet of the Dead" & "Waters of Mars." The longest gap between Smith episodes was 9 months between "The Doctor, the Widow, & the Wardrobe" and "Asylum of the Daleks." 3.) Companion variety creates the illusion of a longer run: Each of Tennant's 3 seasons featured a different companion--Rose, Martha, & Donna. So we got a wide variety of seeing different sides to Tennant's Doctor through how he reacted against various companions. We saw him get all smushy with Rose. We saw him completely oblivious to Martha's unrequited feelings for him. And we saw him counterbalanced with Donna, the only companion with a personality bigger than his. On the other hand, Smith spent the vast majority of his run with Amy & Rory. Clara only barely showed up for the last half-season. (Don't get me wrong, I love Amy & Rory. But it's weird what kind of impression it leaves.) What do you folks think?