Davros was first encountered in the Fourth Doctor story, Genesis of the Daleks, (played by Michael Wisher), He was the chief scientist of the Kaleds, a mutating race contaminated by nuclear and biological weapons. The evolved mutants were weak and crippled. His solution in order for them to survive was to remove all emotions and place them in a ‘Mark III travel machine’. He named these creatures Daleks, an anagram of Kaleds. Davros became obsessed with his creation, considering them to be the ultimate form of life, superior to all other forms.
The next appearance of Davros was in the forth Doctor story Destiny of the Daleks (played by David Gooderson). The concerned Daleks were searching for their creator – who had apparently been in suspended animation since his ‘death’ in Genesis of the Daleks – to help them win their war against the Movellans.
A Fifth Doctor story, Resurrection of the Daleks, saw the third appearance of Davros(now played by Terry Molloy) when a small Dalek force freed him from his space station prison in order to find an antidote for a Movellan – created virus that had all but destroyed them.
Davros returned as ‘The Great Healer’ in the Sixth Doctor story Revelation of the Daleks. Davros was using frozen bodies to create a new, loyal race of Daleks. Davros was destroyed and thought to be dead but he reappeared in his traditional black Dalek styled chair, at the end of the episode a group of renegade Daleks took Davros away to face trial.
The next and final on screen appearance of Davros until 2008 in the seventh Doctor story Remembrance of the Daleks. Davros was known initially as the Dalek Emperor. He made his retreat in an escape pod, his ship being destroyed by the hand of omega.
Davros returned wanting once again to destory all life except Dalek life. Dalek Caan had flown into the Time War and rescued Davros, however when the Doctor arrived on the Dalek Crucible it was the Supreme Dalek who was in control and not Davros.