Bouncy Castle said:
Was The Brig technically a Companion?
My memory is vague - did he ever travel in the Tardis? I have hazy memories of scenes of him in the Tardis, but can't remember if he ever went to distant galaxies or not.
He did on at least two occasions in the TV series. In
The Three Doctors, he was transported along with the TARDIS (though the TARDIS didn't actually move itself, it was transported by an antimatter creature) to Omega's anti-matter world within the black hole (though he initially thought that they were either in another country, thus risking a diplomatic disaster, or a beach in Norfolk). And in
The Five Doctors, he was transported by Time Scoop along with the Second Doctor to Gallifrey. Oh, and in
Mawdryn Undead, the Brigadier (from two different times simultaneously) entered a spaceship in orbit around the Earth.
In other media, he does travel to other worlds. In the radio story
The Paradise of Death, he is transported to at least one other alien planet. In the novel
The Face of the Enemy, he was transported (along with Benton, Ian Chesterton, the Master and Barbara) to the devastated parallel Earth from
Inferno. And in the novel
The Shadow in the Glass, he travels back in time with the Sixth Doctor and meets Hitler.
Anyway, he counts pretty much as a companion. He's worked with the Doctor for so damn long, he'd be an honorary companion at least.