I be worry about how much I would like the new doctor , who be essentially replace ` my doctor ' , but it could not have be a more natural transition . David Tennant be just as wonderful as the Tenth Doctor . he bring he own quirkiness to the character of the Doctor , while still keep some of the dark , emotional side bring in by Eccleston . Billie Piper be back , as well , as he companion . the chemistry between Tennant and Piper be equal to Eccelston , and possibly even better than the first season . season 2 bring back all the good thing about the first and add yet more to the Doctor who universe . it bring laughter and tear and a bittersweet conclusion that will have you reach for a tissue . if you have any doubt about continue on past season one , do not . Tennant deliver , as do the creative staff who have bring we yet another great season of we favorite doctor !