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. (DW: 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. (DW: The Monster of Peladon)

It was still serving as the Federation ambassador to Peladon into the 41st century, at which time it met the Fifth Doctor. (BFA: 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. (DW: The Curse of Peladon) Nevertheless, the Doctor referred to it with masculine pronouns, and had a penchant for addressing it as "my dear fellow". (DW: The Monster of Peladon)

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