Emilie Ullerup as Ashley Magnus (seasons 1--2), the daughter of Dr. Magnus and John Druitt. Ashley is an expert monster hunter, and provides a counterbalance to Dr. Magnus's desire to protect creatures. Christopher Heyerdahl as Bigfoot, a former Neanderthal-like patient of Dr. Magnus who would not leave after he recovered, so Dr. Magnus offered him a position at the Sanctuary as a butler, chauffeur, and body guard.
Christopher Heyerdahl
Dr. Magnus