The Human-Dalek was a unique form of Dalek that was created after the Last Great Time War when only the Cult of Skaro survived the destruction of the Dalek Empire.
The four Daleks travelled to Manhattan in Earth's past where they attempted to restart their species once more. Dalek Sec took the supreme sacrifice of starting the transformation into a hybrid species that took both Human and Dalek qualities. After merging with a Human and beginning the process within his casing, the first Human-Dalek was born.
This Dalek form did not require a casing and was humanoid in shape but with brown skin and an enlarged cranium where small tentacles were present. The most striking feature that is inherited from the Dalek form is the single cyclopean eye. Another noted characteristics is the incorporation of Human emotion and thoughts which allowed them to feel other emotions after millenia of being purged from their bodies. (DW: Daleks in Manhattan)