The Doctor you're referring to is likely the character from the long-running British television series "Doctor Who." In the context of the show, the Doctor is portrayed as a Time Lord, a time-traveling alien from the planet Gallifrey. The Doctor's primary mode of transportation is the TARDIS (Time and Relative Dimension in Space), a spacecraft that can travel through time and space.
In the Doctor Who universe, the Doctor is known to travel freely through time, visiting various historical periods, future civilizations, and even parallel universes. The TARDIS allows the Doctor to traverse the timelines, enabling adventures in both the past and the future.
It's important to remember that Doctor Who is a work of science fiction, and the concept of time travel as depicted in the show is fictional. In reality, our current understanding of physics does not support the possibility of time travel, particularly in the sense of freely navigating the past or altering historical events.
While time travel remains firmly in the realm of imagination and fiction, it continues to captivate audiences and inspire creative storytelling in various forms of media, including Doctor Who.