What is the relationship between the Doctor and the Brigadier?

The relationship between the Doctor and the Brigadier is a complex one that has evolved over the course of the Doctor Who series. The Brigadier, whose full name is Alistair Gordon Lethbridge-Stewart, is a recurring character in the series who is portrayed as a military officer who frequently comes into contact with the Doctor.

Initially, the Brigadier was portrayed as a skeptic who was often reluctant to believe in the Doctor's abilities and his claims about the various alien threats that they encountered. However, over time, the two characters developed a deep respect and friendship for each other, with the Brigadier coming to rely on the Doctor's expertise and knowledge of the universe.

Throughout the series, the Doctor and the Brigadier work together to combat various extraterrestrial threats to the Earth, often teaming up with other recurring characters such as UNIT (Unified Intelligence Taskforce). The Doctor and the Brigadier also share a sense of duty and responsibility to protect the Earth from harm, even if it means putting their own lives at risk.