The Prime Minister

The Minister's ninth regeneration, witnessed by the Third Doctor and Jo Grant, coincided with their promotion from Minister of Foreign Affairs and Diplomacy to the Prime Minister of the planet Samael. Like her predecessors, this new incarnation kept the same face and thus maintained the the alias of Felicity Morgan, but had a different personality, better-suited to this new job - "grounded, hopeful, firm". However, this regeneration was also particularly vulnerable to psychic attacks.

The Raphaelite ambassador was in fact the Master, who had been manipulating Raphael's politics for years and sought to sabotage her TARDIS and regeneration. He hypnotised Felicity and she regressed to her aggressive "Minister of War" persona, eager to enter Samael into the war on Raphael's behalf. However, Jo helped the Minister remember her values, and she turned against the Master, who disappeared.

The Minister allowed the Doctor to place a psychic block in her mind to protect her sanity and remove her ability to control her regenerations. As she vowed to "do more" good, her male assistant commented that she might begin calling herself the "Minister of Luck". (AUDIO: The Same Face)

Notably, another account showed that the Seventh Doctor knew an optimistic Renegade Time Lord who went by the name of "the Minister of Chance, (WC: Death Comes to Time) who later had a further incarnation who also used the name of "Minister of Chance". (AUDIO: The Pointed Hand, etc.)