Uninvited

This is a Re-write of Uninvited Guest Mal discovers an uninvited (?) guest aboard Serenity and questions his motives. The Doctor lands on a ship by the name of Serenity after he receives a distress call. So why is he greeted with such hostility? With the arrival of a strange passenger on Serenity, the relationships of the tight-knit crew are put to the test.