This gold Dalek appeared in Day of the Daleks. It commanded an invasion of Earth, where the Daleks changed history. This Dalek also made a brief appearence at the end of Frontier in Space.
This Dalek appeared in the TV stories Day of the Daleks (1972) and Frontier in Space (1973).
Pictures above are from the TV story titled Day of the Daleks
No one can withstand the power of the Daleks!