Dr. Who and the Daleks

Dr. Who, his granddaughters Susan and Barbara, and Barbara's boyfriend Ian are accidentally transported to another planet by Dr. Who's latest invention, a time and space machine called Tardis. While exploring, the travellers see a city in the distance. They also find a small container of drugs which they take aboard Tardis. Wishing to investigate further, Dr. Who fakes a leak in a fluid link, a vital component of Tardis, to ensure that the group will go to the city to search for the mercury supposedly needed to refill the component. Once in the city, they are captured by cyborg creatures which refer to themselves as "Daleks", who seize the fluid link for examination. Dr. Who then realises that the group have contracted radiation sickness, and that the drugs which they discovered earlier may be their only hope of survival.