The Brigadier has fought with the 2nd, 3rd, 4th, 5th and 7th Doctors.
The Brigadier comes from the Planet Earth and his full name is Brigadier Allister Gordon Lethbridge Stewart. He has appeared with the Second, Third, Fourth, Fifth and Seventh Doctors. He was head of UNIT the United Nations Intellegence Taskforce and when The Doctor met the Brigadier he was only Colonel but then he got promoted to Brigadier. The Brigadier gave The Doctor a Job at UNIT as their Scientific Adviser. The Brigadier always carries a Pistol with him just encase for Emergencies.
The Brigadier has face Monsters like Cybermen, Daleks, Yeti, The Master, Ogrons, Silurians, Sea Devils, Zygons, The Destroyer, Omega, Sontarans, K1 Robot, Autons and many More. He has many Friends which include The Doctor, Jamie McCrimmon, Zoe, Jo Grant, Liz Shaw, Sarah Jane Smith, Ace, Tegan Jovanka, Turlough and many more Companions of The Doctor and other Friends.
He has appeared in Season 5: The Web of Fear.
Season 6: The Invasion.
Season 7: Spearhead from Space, Doctor who and the Silurians, The Ambassadors of Death and Inferno.
Season 8: Terror of the Autons, The Mind of Evil, The Claws of Axos, Colony in Space and The Daemons.
Season 9: Day of the Daleks and The Time Monster.
Season 10: The Three Doctors, and The Green Death.
Season 11: The Time Warrior, Invasion of the Dinosaurs and Planet of the Spiders.
Season 12: Robot.
Season 13: Terror of the Zygons
Season 23: Mawdryn Undead
20th Anniversary Special: The Five Doctors
Season 26: Battlefield