Sabetha

Sabetha was Arbitan's daughter.

Biography
Sabetha sent by her father to find the keys to the Conscience of Marinus. She instead became enslaved in the city of Morphoton. After being freed, she accompanied the First Doctor and his companions in their search for the keys.

Sabetha and Susan Foreman were captured by Vasor, who stole the keys from them and abandoned them in ice caves. After they were rescued by Altos and Ian Chesterton, they retrieved the keys from Vasor and obtained another from the ice cave.

As the Doctor and his companions sought the last key, Sabetha and Altos went ahead with the rest of the keys. They were captured by the Voord Yartek, who had killed Arbitan and took his place. Sabetha and Altos were romantically involved, a relationship which was exploited by the Yartek. After Yartek was defeated, Sabetha and Altos planned to return to Millennius. (TV: The Keys of Marinus)

Personality
Sabetha was an optimist and quick on her feet, insisting that Altos was just a servant so that Yartek would have no need to torture him. (TV: The Keys of Marinus)