not aliens but our future;
not extraterrestrials but extra-temporals;
our evolutionary successors, like Poul Anderson's Danellians.
The originals of the Doctor and his companions fighting the Daleks are the Time Traveller and Weena against the Morlocks.
On a Doctor Who fan's shelves, I saw:
a boxed set of CD's of the first three Doctor Who stories - the beginning;
a boxed set of DVD's of the two feature films starring Peter Cushing - an alternative beginning;
a "Doctor Who: Lost in Time" CD collection of episodes of early stories that no longer exist in their entirety - truly "lost in time";
the DVD of the television film starring Paul McCann in his single appearance as the Doctor;
CD's of various stories featuring different Doctors;
thus, television and cinema history.
The TV series is Doctor Who but the first feature film is Doctor Who And The Daleks and the second is Daleks Invasion Earth 2150 AD so the Daleks take over the titles. In the TV series, the second story is "The Daleks". Curiously, the poster for the second film prominently features not a Dalek but a roboman with Daleks and other figures in the background.
I have stopped watching the TV series which cleverly presented the circular causality paradox in the first "Weeping Angels" story but mishandled causality violation when Rose tried to prevent her father's death. I advise Whovians to read The Time Machine, The Time Patrol and The Time Traveller's Wife.