Doctor Sean Calvin was a scientist, who created a machine that allowed the user to control the minds of a mass number of people.
He was destined to be discredited and essentially exiled for his failed plan to create an army of androids and a mind-control system to take over his home colony Elysium 7. Even after the Seventh Doctor convinced Calvin not to go through with the plan to take over the world, Calvin was eventually forced to use his equipment to save his planet from an alien invasion, resulting in a journalist learning about his original scheme and forcing Calvin to go into unofficial exile.
However, the Doctor mused that his real goal was to ensure that Calvin's daughter, Odessa, was left with a positive example to follow, the Doctor departing with faith that Calvin's final words to his daughter would help her strive to be better and inspire others to do the same, her father's example helping her to recognise that people could not be defined by their mistakes no matter how great those mistakes were. (AUDIO: Forever Fallen)