After a long run with his companions, the tenth Doctor's time finally came. In an incredibly selfless act, he brought another regeneration upon himself. Unlike the other Doctors, the tenth did not want to leave. His reluctance matched those of his fans, many of whom had started with this Doctor due to his meteoric rise in popularity thanks to Tennant's portrayal. Smith's Doctor came on the scene when the show was at the height of popularity. He quickly and capably filled his predecessor's shoes in a return to a more whimsical and larger-than-life portrayal. This Doctor loves his friends, hates his enemies and is quick to join the fray. He is a leader and always takes quick control of any situation. Smith's tenure also marks the show's move into darker, creepier territory with the introduction of some of the scariest, most memorable villains to date. With the upcoming Christmas special and the season to come, the eleventh Doctor continues his adventures to great critical acclaim.
There were several Doctors not mentioned due to the fact that their fit into the canon is debated and uncertain. One, for instance, typically known as the “Shalka” Doctor, was meant to be the ninth Doctor before a reboot of the series put Eccleston into the role instead. In theory, the number of the Doctor's incarnations is limited, but like so many other things in the canon, this fact can change. Currently, Doctor Who continues to be immensely popular both in the United Kingdom and abroad. It is a show that has captured the imagination of many generations, a large part of which is due to the constantly fresh and different portrayal of the lovable main character.