Dalek mutant

Kaled mutants are the mutated descendants of the Kaleds of the planet Skaro. Enclosed in protective armour and weaponry, they became the Daleks, mounted in the upper parts of the Dalek machines.

Physical appearance
Kaled mutants varied in appearance. Their young were globular, soft and shapeless with several tendrils or tentacles (DW: The Power of the Daleks, Genesis of the Daleks). Even the young were quite lethal and capable of strangulation with their tentacles. (DW: Genesis of the Daleks)

Some mutants were eyeless and green and tentacled (DW: The Five Doctors, Resurrection of the Daleks). Others, after the Last Great Time War, were pale blue-green or green-brown with one eye. (DW: Dalek, The Parting of the Ways)

History
The Kaled mutants were created by Davros towards the end of the Thousand Year War between the Kaleds and the Thals. They were created after the Skarosian races were starting to become mutated by the use of nuclear and chemical agents used in the war. Davros artificially accelerated the mutations, trying to find the ultimate evolutionary form of the Kaled race, and developed the mutants. These mutants were later placed in the Mark III Travel Machines and became the dreaded Daleks. (DW: Genesis of the Daleks)

Other
Kaled Mutants are quite possibly fatal to a Time Lord when eaten. (EDA: The Scarlet Empress)