Alpha Centauri (The Curse of Peladon)

Alpha Centauri was the Alpha Centauran delegate to the planet Peladon.

Biography
Alpha Centauri first came to Peladon on the Committee of Assessment to review their petition to enter the Galactic Federation. It aided the Third Doctor in defeating Hepesh and Arcturus. (TV: The Curse of Peladon)

Fifty years later, Alpha Centauri was the Galactic Federation ambassador to Peladon. It again helped the Third Doctor, this time to defeat the plans of Eckersley and a group of renegade Ice Warriors led by the Ice Lord Azaxyr. (TV: The Monster of Peladon)

It was still serving as the Federation ambassador to Peladon into the 41st century, when it was nearing retirement age. At this time, it escorted Princess Pandora of Earth to be wed to King Peleas, unaware that she was being led to her death at the hands of Sekhmet. It non-violently stopped Arktos from taking trisilicate from a sabotaged mining operation and helped the Fifth Doctor and Peri return to the TARDIS in orbit around Peladon as a small detour.

Following the death of Pandora, as well as the Martian royalty, Prince Zixlyr and Princess Alixlyr, Alpha Centauri knew it had months of negotiation with the Earth and Martian governments to consider before retiring. (AUDIO: The Bride of Peladon)

Characteristics
Although it had a more feminine and squeaky falsetto voice, Alpha was neither male nor female; it was a hermaphrodite hexapod according to the Doctor. (TV: The Curse of Peladon) Nevertheless, the Doctor referred to it with masculine pronouns, and had a penchant for addressing it as "my dear fellow". (TV: The Monster of Peladon)

Like most of its race, Alpha Centauri was a natural pacifist and a hypochondriac. (TV: The Curse of Peladon, TV: The Monster of Peladon)