Who is the Master and what is his relationship to the Doctor?

The Master is a recurring villain in the British science fiction television series Doctor Who, which follows the adventures of a time-traveling alien known as the Doctor. The character was first introduced in 1971 and has since been played by multiple actors. The Master is a Time Lord, the same alien species as the Doctor, and was once a childhood friend of the Doctor's. However, the two have since become bitter enemies, with the Master often attempting to defeat and kill the Doctor.

The Master is known for his cunning and intelligence, as well as his ability to manipulate people and events to his advantage. He is often portrayed as a dark mirror of the Doctor, with a similar intelligence and charisma but a far more evil and destructive nature. Over the years, the Master has been involved in a number of complex and often convoluted storylines, with the character repeatedly being resurrected or reincarnated in different forms. Despite this, the Master remains one of the most iconic and enduring villains in the Doctor Who universe.

The Master is a fictional character in the British science fiction television series Doctor Who. They are a renegade alien Time Lord and the childhood friend and later archenemy of the title character, the Doctor. The Master has been portrayed by seven actors over the course of the show's history: Roger Delgado (1971–1979), Peter Pratt (1981), Geoffrey Beevers (1983–1984), Anthony Ainley (1986–1999), Eric Roberts (2007), Michelle Gomez (2014–2017), and Sacha Dhawan (2020–present).

The Master is a Time Lord, a race of humanoid aliens from the planet Gallifrey. They are gifted with the ability to regenerate their bodies when they are injured, which allows them to live for an indefinite period of time. The Master is also a brilliant scientist and a skilled manipulator. They are often driven by a desire for power and control, and they have been responsible for some of the Doctor's most dangerous enemies.

The Master and the Doctor were once close friends, but they fell out after the Master became corrupted by their own power. The Master has since become one of the Doctor's most persistent enemies, and they have fought each other on numerous occasions. However, the Master and the Doctor also share a complex relationship, and they have been known to help each other out on occasion.

The Master is a complex and fascinating character, and they have been one of the most popular villains in Doctor Who history. They are a brilliant and dangerous adversary, and they always provide the Doctor with a challenge. The Master is also a tragic figure, and their story is one of loss, betrayal, and redemption.