Races Intelligence Command, UNIT's equivalent in that alternate world. Other appearances Frost is one of the few characters from the comic strip that has made the cross-over into the other spin-off media. She made a brief appearance (holding the rank of captain in 1980) in the Big Finish Productions audio play The Fires of Vulcan (voiced by Karen Henson). In a link to the 2005 episode "Aliens of London", a page from the "official" UNIT website created by the BBC for the 2005 series of Doctor Who mentioned a formidable female UNIT officer named Frost, who was stationed in Geneva as of the year 2006. In the episode itself, a female UNIT major general in a United States Army uniform, wearing a tag with the name "Frost" was among a group of "alien experts" killed by the Slitheen. According to the Series One Companion, early drafts of the script had the Ninth Doctor refer to her explicitly as "Muriel Frost", but the line never made it to screen. The situation is muddled somewhat by the use of Muriel Frost as a narrator of the episode guide in the children's Doctor Who Classified! 3D Dossier, which would suggest that she is still alive. Comics characters introduced in 1991 Doctor Who comic strip characters Doctor Who audio characters Female characters in comics UNIT personnel Fictional colonels