The Crew of the ARK II are roaming the earth in search of villages of humanity and they attempt to help out where ever possible. The ARK II seems to have unlimited supplies of everything.
A village is suffering from a plague, but the people are afraid to communicate to others. The father of the village leader uses balloons to send messages out of the village and the ARK crew finds one of these notes.
After convincing the village they are not there to hurt them, they develop a innoculation to the plague and make friends