Davros is a fictional male Daleks in the Doctor Who series. Davros is a Dalek that is half human and half machine, he is the scientist that is credited with designing the machines that the Daleks retreat to after poisoning their planet during a world war. Davros is a reoccuring character in the stories and always a disfigured cross breed.
The first time we see Davros is when the Doctor is sent to Skaro by his fellow Timelords with the aim of stopping the creation of the Daleks in the episode, Genesis of the Daleks. At the last moment, the Timelords change their mind and prevent the Doctor from creating the Daleks. Davros isn't dead and returns through the many series to give the Doctor problems.