Ashtallan
From Tardis Wiki, the free Doctor Who reference
The Ashtallan were a race of people that lived on the planet, Ashtallah. The Ashtallans were immortal and their cells can heal mortal wounds when injected. Brenna and Sharlan were among the first scientists of their race.
When the Doctor, barbara and susan arrived on the planet, the Ashtallons were fascinated with the expereinces, such as death.
