Every Doctor Who, ranked from worst to best

April 15 marks the beginning of the end for Peter Capaldi on BBC America's "Doctor Who."

At the end of the upcoming 10th season, Capaldi will wrap up his three-season run as the time-traveling, human-loving protector of the universe, the 12th official regeneration of the Doctor.

Capaldi's still-unnamed replacement will take on a tradition that dates back to 1963 and includes 14 men who have played the role over nearly five decades.

But as the search is on for Capaldi's successor, it's a great time to remind ourselves of the Doctors who won our appreciation and those who didn't.

Here is every Doctor Who ranked from the worst to the best: