1. Genesis of the Daleks (1975, 4th Doctor)
Written by: Terry Nation
Davros played by: Michael Wisher
When Davros first encountered the Fourth Doctor, he was the chief scientist of the Kaleds, heading the Elite Scientific Division. Davros realised that contamination from the nuclear and biological weapons used in the war was mutating the Kaled race and artificially accelerated the process to examine the ultimate evolutionary end product. The mutations were weak and crippled: no more than brains with tentacular appendages and with no hope of survival on their own. His solution was to remove all emotions pertaining to weakness, a category in which he grouped such emotions as compassion, mercy and kindness, and place the mutants in tank-like "Mark III travel machines" that were partly based on the design of his wheelchair. He later named these creatures Daleks, an anagram of Kaleds.
Davros quickly became obsessed with his creations, considering them to be the ultimate form of life, superior to all others. To stop his own people from shutting down his Dalek project, he arranged for them to be wiped out by the Thals. The Daleks then almost exterminated the Thal victors, but ultimately turned on Davros and apparently killed him at the conclusion of the serial.