They are found and brought to a colony of Humans. They've just discovered a capsule and inside is a Dalek. These humans do not understand the danger of the Daleks, and they proceed to wake it up. To the great alarum of the Doctor. Over the course of this adventure the Dalek, and soon Daleks, pretend to be servants, but very demanding servants. Their demands grow to include resources the Daleks use to build more Daleks. An added complication is some of the humans are plotting a rebellion, and hope to use the Daleks as soldiers in their rebellion. Foolish humans.
Eventually they commit the rebellion and the Daleks start killing all the humans. Of course their plan is, as always, to EXTERMINATE everything other than themselves. But the Doctor pulls some kind of magic trick on the power supply control panels which feeds them incorrect power or too much power or something and they start spinning and screaming and blowing up. Yay, everybody's saved!
A detail about the Daleks is explained, their use of 'Static Electricity'. This power source is mentioned in other episodes.