An unknown alien virus had infected some of my people. We put them in stasis and quarantined them on a space station orbiting Gallifrey, but we don't know what the virus is or how to combat it. The recent wars have left us with a critical shortage of medical personnel, so your assistance in the matter would be greatly appreciated. Not to mention that, to be quite frank, you probably have more experience with alien contagions than most Time Lord physicians would.