Cristián Xochitl Alvarez was a human psychic. He obtained the ability to see the Blue after taking LSD in 1968. When the Seventh Doctor took him to the RMS Titanic before it sank to retrieve the Codex Atlaca, Huitzilin attacked and drained the Doctor's life force, making Huitzilin fully corporeal. Cristian grabbed a gun and shot Huitzilin, killing him and returning the Doctor to life. (PROSE: The Left-Handed Hummingbird)

Cristián and his son Ben were among the guests at Bernice Summerfield and Jason Kane's wedding in Cheldon Bonniface on 24 April 2010. (PROSE: Happy Endings)

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