Archer (Dalek duplicate)

A Dalek duplicate of Colonel Archer was created to replace the original Archer, who was killed by Lytton's "policemen".

Biography
Tegan Jovanka realised this wasn't the real Colonel Archer when she noticed the duplicate was wearing a gun-belt, which the real Archer had given to the Fifth Doctor before leaving to find a telephone to call his H.Q. for reinforcements, in case any more Daleks materialised in the warehouse via the time corridor.

The duplicate was killed fighting Daleks loyal to Davros. (TV: Resurrection of the Daleks)