Hostess (Midnight)
From Tardis Wiki, the free Doctor Who reference
The Hostess was a human who served the beings who wanted to go to the planet Midnight, via shuttle bus. When the ship was attacked by the Midnight Entity it possesed Sky Silvestry. She was the first person to sugest whether they should thrugh Sky out.She made her dessision after she relised that Sky was Possesed and gave her life to defeat Sky becuase she had almost killed the Doctor.
After her death, the Doctor and the surviving passengers realize to their regret that none of them found out her name. (DW: Midnight)