The "Leopards won't eat my face" crowd aside, I've seen two different videos where people risked their lives and the lives of others, in order to retrieve their bags, instead of evacuating a plane, that's on fire, in a orderly manner.

2/2

Actually Moonbase. Invasion is his first appearance as Benton, though he was corporeal at the time.

Yeah I keep forgetting about that, even though it's my guilty pleasure story.

I personally consider Lethbridge-Stewart and Sgt. Benton companions mainly because they've traveled in TARDIS. Both in The Three Doctors, and Alistair from 2 different time periods in Mawdryn Undead. Plus Alistair was taking by Time Scoop with the Second Doctor in The Five Doctors.

Interesting officially BBC doesn't consider Sara a companion, but back in the day most fans did. Katarina (who is even shorter lived than Sara) still is though.

I knew about the Yeti but not the Cybermen.

I think the Doctor only uses it as a last result and refuses to consciously choose a new face (like when the Second Doctor refused to accept any of the choices shown by the Timelords). Eight becoming The War Doctor (in Night of the Doctor minisode) is the only time he chooses to regenerate.