How has Doctor Who dealt with the concept of mortality and death?

Doctor Who, a British science fiction television series that has been on air for over 50 years, has explored the theme of mortality and death in various ways. One of the unique features of the show is that the lead character, known as the Doctor, is an alien Time Lord who can regenerate into a new body when near death, allowing for new actors to play the role over time.

The show has explored the emotional impact of death and the idea of regeneration. The show also touches on the idea that sometimes death is permanent, especially for humans and other beings without the ability to regenerate.

The show also frequently deals with the theme of sacrifice, where characters must make difficult choices that can result in their own death, in order to save others or the universe itself.

Overall, Doctor Who has explored the concept of mortality and death in unique and thought-provoking ways, often highlighting the importance of life and the sacrifices made to protect it.