Krisztina was the Princess of Galen on Világ.
She was to be married to the prince of the rival country Viktor of Malendia, although she secretly still loved Reid. She helped Evelyn Smythe when she fainted in her gardens. She made the Sixth Doctor her adviser. When the Doctor was imprisoned she helped him escape. When the Killorans invaded she fought to protect her palace. She was murdered by Pokol in his rage. (AUDIO: Arrangements for War)