Dalek suicide

The Dalek, who goes through a traumatic roller coaster of discovering morality, discovering emotions beyond hate and fear, and being unable to kill anything that it hates, begs Rose to make it commit suicide as it watches the sunlight, unable to do anything. Rose complies. It gives one last, rather morose-sounding "Exterminate!" before blowing itself up out of self-loathing.

Example of:
Alas, Poor Villain